Document:

<PAGE>

                                                                    EXHIBIT 4.11

                               CLOSING INSTRUMENT

         WHEREAS, the parties named herein desire to enter into certain Program
Documents contained herein, each such document dated as of this o day of o, 200o
(the "Original Issue Date"), relating to the issuance by Principal Life Income
Fundings Trust o (the "Trust") of Notes to investors under Principal Life's
secured notes program;

         WHEREAS, the Trust is a trust organized under, and its activities will
be governed by, the provisions of the Trust Agreement as set forth in the
omnibus instrument related to the Trust dated as of the date of the Pricing
Supplement (the "Omnibus Instrument");

         WHEREAS, certain licensing arrangements between the Trust and Principal
Financial Services, Inc. will be governed pursuant to the provisions of the
License Agreement, as set forth in the Omnibus Instrument;

         WHEREAS, the Notes will be issued pursuant to the Indenture, as set
forth in the Omnibus Instrument (the "Indenture");

         WHEREAS, the sale of the Notes will be governed by the Terms Agreement,
as set forth in the Omnibus Instrument;

         WHEREAS, certain custodial arrangements of the Funding Agreement and
the Guarantee will be governed pursuant to the provisions of the Custodial
Agreement dated as of o, 2006 by and among Bankers Trust Company, N.A., acting
as custodian (the "Custodian"), the Indenture Trustee and the Trustee, on behalf
of the Trust;

         WHEREAS, certain agreements relating to the Notes, the Funding
Agreement and the Guarantee are set forth in the Coordination Agreement, as set
forth in the Omnibus Instrument.

         All capitalized terms used herein and not otherwise defined will have
the meanings set forth in the Indenture.

                  [Remainder of Page Intentionally Left Blank]

<PAGE>

                                     PART I
                            INSTRUCTIONS OF THE TRUST

         As of the Original Issue Date, the Trust herewith delivers to the
Indenture Trustee, or has caused to be delivered to the Indenture Trustee, the
Notes specified in the Pricing Supplement, having the [principal amount/face
amount] as set forth in the Omnibus Instrument.

         As of the Original Issue Date, the Trust hereby instructs the Indenture
Trustee to take all actions required to be taken with respect to the Notes under
Section 2.05(e) of the Standard Indenture Terms.

         As of the Original Issue Date, Principal Life and the Trust hereby
direct the Indenture Trustee to deposit the amount of $o, the Net Proceeds to
the Trust (as specified in the Pricing Supplement) in respect of the Notes to:

   Bank: o

   ABA #:  o

   Account #: o

   Contract #: o

         As of the Original Issue Date, the agents specified in the Pricing
Supplement hereby direct the Indenture Trustee to deliver the Notes as follows:

         [Purchasing Agent] DTC #o

         The Depository Trust Company

                  [Remainder of Page Intentionally Left Blank]

                                      I-1
<PAGE>

                                    PART II
            ACKNOWLEDGMENT OF INDENTURE TRUSTEE CONCERNING THE NOTES

         The Indenture Trustee certifies, as of the Original Issue Date, the
following:

         (a) The Indenture Trustee acknowledges receipt of the Notes; and

         (b) The Indenture Trustee (including in its capacity as Registrar) has
taken all action required to be taken with respect to the Notes under Section
2.05(e) of the Standard Indenture Terms.

                  [Remainder of Page Intentionally Left Blank]

                                      II-1
<PAGE>

                                    PART III
    CERTIFICATE REGARDING CUSTODY OF THE FUNDING AGREEMENT AND THE GUARANTEE

         In connection with the issuance of the Funding Agreement and the
Guarantee, the Assignment of Funding Agreement and Guarantee (set forth in Part
IV of this Closing Instrument), the Custodian hereby represents that it has
received delivery of the Funding Agreement and the Guarantee and is holding the
Funding Agreement and the Guarantee for the benefit of the Indenture Trustee and
that the Funding Agreement and the Guarantee are in the possession of the
Custodian at the address below:

         Bankers Trust Company, N.A.
         453 7th Street
         Des Moines, Iowa  50309-2728

                  [Remainder of Page Intentionally Left Blank]

                                     III-1
<PAGE>

                                    PART IV
                  ASSIGNMENT OF FUNDING AGREEMENT AND GUARANTEE

         Pursuant to the terms of the Indenture, the Trust hereby grants to the
Indenture Trustee, for the benefit of the Holders of the Notes, a first priority
perfected security interest in, and collaterally assigns to the Indenture
Trustee, for the benefit of the Holders of the Notes, the Trust's right, title,
benefits, remedies and interests in, to and under the Funding Agreement, the
Guarantee and the other Collateral described in the Indenture and all of its
rights and privileges with respect to the Collateral and all income and profits
thereon, and all interest, dividends and other payments and distributions with
respect thereto, and all Proceeds of the foregoing.

         Each of the Trust, the Indenture Trustee, Principal Life and PFG hereby
agrees that, in furtherance of the collateral assignment described above, until
such time as the Indenture Trustee notifies the Trust, Principal Life and PFG
that all obligations of the Trust pursuant or related to the Notes have been
paid or satisfied in full, the Indenture Trustee shall have and may exercise the
rights and remedies of an Agreement Holder (as defined in the Funding Agreement)
under the Funding Agreement and of the Trust under the Guarantee.
Notwithstanding the foregoing (and whether or not the foregoing notification is
given) and Section 5 of the Funding Agreement (which Principal Life acknowledges
and agrees has been complied with) all obligations, representations and
warranties of an Agreement Holder under the Funding Agreement and of the Trust
under the Guarantee shall nevertheless remain obligations, representations and
warranties of the Trust, as the case may be, and shall not be obligations of the
Indenture Trustee. Principal Life, PFG and the Trust hereby agree that, until
such time as the Indenture Trustee notifies the Trust, Principal Life and PFG
that all obligations of the Trust pursuant to or related to the Notes have been
paid or satisfied in full, Principal Life and PFG, as applicable, will comply
with instructions originated by the Indenture Trustee with respect to the
Funding Agreement and the Guarantee, as applicable, without further consent by
the Trust.

         Principal Life and PFG hereby affirm that they have recorded the
collateral assignment and grant of the security interest on their books and
records to reflect the same described above. Principal Life and PFG each agree,
as applicable, that it will comply with all orders of the Indenture Trustee with
respect to the Funding Agreement and the Guarantee, as applicable without any
further consent of the Trust. Each of Principal Life and PFG hereby confirms
that it has received all documents and instruments which it requires pursuant to
the terms of the Funding Agreement and Guarantee, as applicable, in connection
with the collateral assignment and grant of such security interest and/or rights
of the Indenture Trustee hereunder.

         Each of Principal Life and PFG hereby also represents that it has not
received any notice of any adverse claim to the Funding Agreement or Guarantee,
as applicable, other than the creation and perfection of a security interest in
the Funding Agreement and Guarantee, as applicable, and the proceeds thereof as
described herein.

         The collateral assignment and grant of the security interest and this
instrument shall be governed by, and shall be construed and enforced in
accordance with, the laws of the State of New York, without regard to conflicts
of laws principles thereof, and shall be binding upon, and shall inure to the
benefit of, the parties hereto and their respective successors and assigns.

         This instrument may not be amended, modified or waived without the
consent of the Indenture Trustee, the Trust, Principal Life and PFG.

         The Custodian hereby acknowledges the terms of this Assignment of
Funding Agreement and Guarantee.

                                      IV-1
<PAGE>

                                     PART V
          ACKNOWLEDGEMENT OF FUNDING AGREEMENT AND GUARANTEE ASSIGNMENT

         Simultaneously herewith, Principal Life has issued the Funding
Agreement to the Trust and PFG has issued the Guarantee to the Trust. By this
instrument, the receipt of which Principal Life and PFG hereby acknowledge, the
Trust has informed Principal Life and PFG that it has conveyed and assigned (for
security purposes) all of its right, title, benefits, remedies and interests in,
to and under the Funding Agreement and the Guarantee to the Indenture Trustee
pursuant to the Indenture.

         Principal Life and PFG hereby consent to the aforementioned assignment
of the Funding Agreement and the Guarantee, as applicable, with respect to the
assignment thereof to the Indenture Trustee under the Indenture. Principal Life
and PFG affirm that they have changed their books and records to reflect such
assignment and agree to make payments in accordance with the terms of the
Funding Agreement and the Guarantee, as applicable, to the Indenture Trustee.
Principal Life and PFG also agree that all of the covenants made in the Funding
Agreement and the Guarantee, as applicable, are also for the benefit of the
Indenture Trustee, and further agree that Principal Life and PFG shall deliver
to the Indenture Trustee duplicate original copies of all notices, statements,
communications and instruments delivered by Principal Life and PFG, as
applicable, to the Trust pursuant to the Funding Agreement and the Guarantee, as
applicable.

         Principal Life and PFG agree to execute and deliver to the Trust and
the Indenture Trustee such documents and take such other action as the Trust and
the Indenture Trustee may reasonably request in order to ensure that the consent
granted by Principal Life and PFG pursuant to the preceding paragraph shall
remain continuously effective until the termination of the Funding Agreement and
the Guarantee, as applicable. The consent contained in the preceding paragraph
is coupled with an interest and shall be irrevocable.

         This acknowledgment of collateral assignment and grant of security
interest and this instrument shall be governed by, and shall be construed and
enforced in accordance with, the laws of the State of New York, without regard
to conflicts of laws principles thereof, and shall be binding upon, and shall
inure to the benefit of, the parties hereto and their respective successors and
assigns.

         This instrument may not be amended, modified or waived without the
consent of the Indenture Trustee, the Trust, Principal Life and PFG.

         The Custodian hereby acknowledges the terms of this Acknowledgment of
Funding Agreement and Guarantee Assignment.

                  [Remainder of Page Intentionally Left Blank]

                                      V-1
<PAGE>

                                    PART VI
                           NOTICE OF SECURITY INTEREST

         Pursuant to the Indenture, the Trust has collaterally assigned the
Funding Agreement and Guarantee to the Indenture Trustee pursuant to the
Indenture.

         Notice is hereby given that the Indenture Trustee, on behalf of the
Holders of the Notes, has a security interest in the Collateral, including, but
not limited to, any and all payments to be made by Principal Life to the Trust
pursuant to the Funding Agreement and any and all payments to be made by PFG to
the Trust pursuant to the Guarantee. Each of Principal Life and PFG, by
executing this instrument, hereby (x) consents to the security interest granted
by the Trust, to the Indenture Trustee in the payments under the Funding
Agreement and Guarantee, as applicable, (y) agrees to make all payments due
under the Funding Agreement and Guarantee, as applicable, to the Collection
Account or any other account designated in writing to Principal Life or PFG, as
applicable, by the Indenture Trustee and (z) agrees to comply with all orders of
the Indenture Trustee with respect to the Funding Agreement and Guarantee, as
applicable, without any further consent from the Trust.

         This notice of security interest shall be governed by, and shall be
construed and enforced in accordance with, the laws of the State of New York,
without regard to conflicts of laws principles thereof, and shall be binding
upon, and shall inure to the benefit of, the parties hereto and their respective
successors and assigns.

         This instrument may not be amended, modified or waived without the
consent of the Indenture Trustee, the Trust, Principal Life and PFG.

         The Custodian hereby acknowledges the terms of this Notice of Security
Interest.

                  [Remainder of Page Intentionally Left Blank]

                                      VI-1

<PAGE>

                                    PART VII
                      PRINCIPAL LIFE OFFICER'S CERTIFICATE

         The undersigned, an authorized officer of Principal Life, does hereby
certify to each agent that is a party to the Terms Agreement (as defined in the
Omnibus Instrument) relating to the Notes, in such capacity and on behalf of
Principal Life, pursuant to the Distribution Agreement, that:

         1. Since the respective dates as of which information is given in the
Prospectus (as defined in the Distribution Agreement), as of the date hereof,
there has been no material adverse change in the condition, financial or
otherwise, or in the earnings, business affairs or business prospects of
Principal Life and its subsidiaries considered as one enterprise, whether or not
arising in the ordinary course of business;

         2. The representations and warranties of Principal Life contained in
the Distribution Agreement are true and correct with the same force and effect
as though expressly made at and as of the date hereof;

         3. Principal Life has complied with all agreements and satisfied all
conditions on its part to be performed or satisfied at or prior to the date
hereof; and

         4. No stop order suspending the effectiveness of the Registration
Statement (as defined in the Distribution Agreement) has been issued and no
proceedings for that purpose have been instituted or are pending or, to the best
of such person's knowledge, are threatened by the Commission (as defined in the
Distribution Agreement).

         5. Since the date of the Prospectus, there has occurred no event
required to be set forth in an amendment or supplement to the Registration
Statement or Prospectus, and there has been no document required to be filed
under the 1933 Act, the 1933 Act Regulations, the 1934 Act or the 1934 Act
Regulations (all as defined in the Distribution Agreement) which, upon filing,
would be deemed to be incorporated by reference in the Prospectus which has not
been so filed.

                  [Remainder of Page Intentionally Left Blank]

                                     VII-1
<PAGE>

                                   PART VIII
                            PFG OFFICER'S CERTIFICATE

         The undersigned, an authorized officer of PFG, does hereby certify to
each Purchasing Agent that is a party to the Terms Agreement (as defined in the
Omnibus Instrument) relating to the Notes, in such capacity and on behalf of
PFG, pursuant to the Distribution Agreement, that:

         1. Since the respective dates as of which information is given in the
Prospectus (as defined in the Distribution Agreement), as of the date hereof,
there has been no material adverse change in the condition, financial or
otherwise, or in the earnings, business affairs or business prospects of PFG and
its subsidiaries considered as one enterprise, whether or not arising in the
ordinary course of business;

         2. The representations and warranties of PFG contained in the
Distribution Agreement are true and correct with the same force and effect as
though expressly made at and as of the date hereof;

         3. PFG has complied with all agreements and satisfied all conditions on
its part to be performed or satisfied at or prior to the date hereof; and

         4. No stop order suspending the effectiveness of the Registration
Statement (as defined in the Distribution Agreement) has been issued and no
proceedings for that purpose have been instituted or are pending or, to the best
of such person's knowledge, are threatened by the Commission (as defined in the
Distribution Agreement).

         5. Since the date of the Prospectus, there has occurred no event
required to be set forth in an amendment or supplement to the Registration
Statement or Prospectus, and there has been no document required to be filed
under the 1933 Act, the 1933 Act Regulations, the 1934 Act or the 1934 Act
Regulations (all as defined in the Distribution Agreement) which, upon filing,
would be deemed to be incorporated by reference in the Prospectus which has not
been so filed.

                  [Remainder of Page Intentionally Left Blank]

                                     VIII-1

<PAGE>

                                    PART IX
                               TRUST CERTIFICATES

         A. Trust Certificate pursuant to the Distribution Agreement

         The Trust does hereby certify to each Purchasing Agent that is a party
to the Terms Agreement (as defined in the Omnibus Instrument) relating to the
Notes, in such capacity and on behalf of the Trust, pursuant to the Distribution
Agreement and Terms Agreement, as applicable, that:

         1. Since the respective dates as of which information is given in the
Prospectus (as defined in the Distribution Agreement), as of the date hereof,
there has been no material adverse change in the condition, financial or
otherwise, or in the earnings, business affairs or business prospects of the
Trust, whether or not arising in the ordinary course of business;

         2. The representations and warranties of the Trust contained in the
Distribution Agreement are true and correct with the same force and effect as
though expressly made at and as of the date hereof; and

         3. The Trust has complied with all agreements and satisfied all
conditions on its part to be performed or satisfied at or prior to the date
hereof.

         B. Trust Certificate pursuant to Section 314(c) of the Trust Indenture
Act

         The undersigned, a Responsible Officer of the Trustee, on behalf of the
Trust and pursuant to Section 1.02 of the Standard Indenture Terms, does hereby
certify to the Indenture Trustee as follows:

         1. I am familiar with the Indenture and have read the covenants,
conditions and definitions contained therein related to the issuance,
authentication and delivery of the Notes;

         2. As to the matters set forth herein, I either have personal knowledge
thereof or have obtained knowledge thereof from officers or employees of the
Trust, Principal Life or PFG in whom I have confidence and whose duties require
them to have personal knowledge thereof. In my opinion, I have made such
examination and investigation as has been necessary to enable me to express an
informed opinion as to whether or not the covenants or conditions contained in
the Indenture have been complied with; and

         3. All conditions precedent provided for in the Indenture to the
authentication and delivery of the Notes have been complied with.

         It is expressly understood that: (i) this Certificate is executed by
U.S. Bank Trust Company, N.A., not in its individual capacity but solely as
Trustee of the Trust, in the exercise of the power and authority conferred and
vested in it as such Trustee and (ii) each of the representations made herein by
the Trustee are not personal representations, undertakings and agreements of
U.S. Bank Trust Company, N.A., or its officers, but are binding solely on the
Trust.

                                       IX-1

<PAGE>

                                     PART X
                          PRINCIPAL LIFE CERTIFICATION

         Principal Life certifies, as of the Original Issue Date, that the
Principal Life Officer's Certificate, a copy of which is attached as Exhibit A
to this Closing Instrument, is true and correct and remains in full force and
effect.

                  [Remainder of Page Intentionally Left Blank]

                                      X-1

<PAGE>
                                    PART XI
                                PFG CERTIFICATION

         PFG certifies, as of the Original Issue Date, that the PFG Officer's
Certificate, a copy of which is attached as Exhibit B to this Closing
Instrument, is true and correct and remains in full force and effect.

                  [Remainder of Page Intentionally Left Blank]

                                      XI-1

<PAGE>

                                    PART XII
                         INDENTURE TRUSTEE CERTIFICATION

         The Indenture Trustee certifies, as of the Original Issue Date, that
the Indenture Trustee Officer's Certificate, a copy of which is attached as
Exhibit C to this Closing Instrument, is true and correct and remains in full
force and effect.

                  [Remainder of Page Intentionally Left Blank]

                                      XII-1

<PAGE>

                                   PART XIII
                              TRUSTEE CERTIFICATION

         The Trustee certifies, as of the Original Issue Date, that the Trustee
Officer's Certificate, a copy of which is attached as Exhibit D to this Closing
Instrument, is true and correct and remains in full force and effect.

                  [Remainder of Page Intentionally Left Blank]

                                      XIII-1

<PAGE>

                                    PART XIV
                         PURCHASING AGENT CERTIFICATION

         On the date hereof, the Trust will issue Notes in accordance with the
terms of the Distribution Agreement. The Purchasing Agent hereby certifies to
Principal Life, PFG and the Trust as follows:

         (i) that such Purchasing Agent has anti-money laundering policies and
procedures in place in accordance with the requirements imposed by the Uniting
and Strengthening America by Providing Appropriate Tools Required to Intercept
and Obstruct Terrorism Act of 2001 (USA PATRIOT Act), Pub. L, 107-56, 115 Stat.
280 (October 26, 2001), or any rules or regulations promulgated thereunder, and
the Foreign Assets Control Regulations issued by the Office of Foreign Assets
Control of the United States Department of Treasury (31 CFR Part 500), in each
case to the extent applicable to such Purchasing Agent; and

         (ii) that such Purchasing Agent has implemented an anti-money
laundering compliance program pursuant to NASD Rule 3011, to the extent
applicable to such Purchasing Agent.

                  [Remainder of Page Intentionally Left Blank]

                                      XIV-1

<PAGE>

                                    PART XV
                                  CROSS-RECEIPT

         The Trust hereby acknowledges receipt of the Net Proceeds to the Trust
(as specified in the Pricing Supplement) from the Indenture Trustee and herewith
delivers to the Indenture Trustee, or has caused to be delivered to the
Indenture Trustee, the Notes, duly executed by the Trust pursuant to the
Indenture.

         The Trust hereby acknowledges receipt of funds for the Trust Beneficial
Interest from or at the direction of the Trust Beneficial Owner and has caused
to be registered in the name of the Trust Beneficial Owner the Trust Beneficial
Interest pursuant to the Trust Agreement.

         Principal Life hereby acknowledges receipt of the Net Proceeds to the
Trust and, for purposes of the Funding Agreement, the receipt of the Net
Proceeds to the Trust shall be deemed to be receipt by Principal Life in full of
the Net Deposit (as specified in the Funding Agreement). Principal Life herewith
delivers to the Indenture Trustee, or has caused to be delivered to the
Indenture Trustee, the Funding Agreement, duly executed by Principal Life.

         The Custodian, on behalf of the Indenture Trustee, hereby acknowledges
receipt from Principal Life of the Funding Agreement.

         The Custodian, on behalf of the Indenture Trustee, hereby acknowledges
receipt from PFG of the Guarantee.

         The Trust Beneficial Owner hereby acknowledges ownership of the Trust
Beneficial Interest.

         PFG and the Indenture Trustee hereby acknowledge the terms of this
Cross-Receipt.

                  [Remainder of Page Intentionally Left Blank]

                                      XV-1

<PAGE>

                                    PART XVI
                        MISCELLANEOUS AND EXECUTION PAGES

         This Closing Instrument may be executed by each of the parties hereto
in any number of counterparts, and by each of the parties hereto on separate
counterparts, each of which counterparts, when so executed and delivered, shall
be deemed to be an original, but all such counterparts shall together constitute
but one and the same instrument.

         Each signatory, by its execution hereof, does hereby become a party to
each of the agreements or instruments identified for such party as of the
Original Issue Date.

         IN WITNESS WHEREOF, the undersigned have executed this Closing
Instrument with respect to the Trust, dated as of the date first written above.

                                    By:      PRINCIPAL LIFE INSURANCE COMPANY
                                             (in executing below agrees and
                                             becomes a party to (i) the
                                             Instructions of the Trust set forth
                                             in Part I herein, (ii) the
                                             Assignment of Funding Agreement and
                                             Guarantee set forth in Part IV
                                             herein, (iii) the Acknowledgement
                                             of Funding Agreement and Guarantee
                                             Assignment set forth in Part V
                                             herein, (iv) the Notice of Security
                                             Interest set forth in Part VI
                                             herein, (v) the Principal Life
                                             Certification set forth in Part X
                                             herein and (vi) the Cross-Receipt
                                             set forth in Part XV herein)

                                             By: ________________________
                                             Name: ______________________
                                             Title: _____________________

                                    By:      PRINCIPAL FINANCIAL GROUP, INC. (in
                                             executing below agrees and becomes
                                             a party to (i) the Assignment of
                                             Funding Agreement and Guarantee set
                                             forth in Part IV herein, (ii) the
                                             Acknowledgement of Funding
                                             Agreement and Guarantee Assignment
                                             set forth in Part V herein, (iii)
                                             the Notice of Security Interest set
                                             forth in Part VI herein, (iv) the
                                             PFG Certification set forth in Part
                                             XI herein and (v) the Cross Receipt
                                             set forth in Part XV herein)

                                             By: ________________________
                                             Name: ______________________
                                             Title: _____________________

                             [Execution Page 1 of 4]

<PAGE>

                                    By:      THE PRINCIPAL LIFE INCOME FUNDINGS
                                             TRUST DESIGNATED IN THIS CLOSING
                                             INSTRUMENT (in executing below
                                             agrees and becomes party to (i) the
                                             Instructions of the Trust set forth
                                             in Part I herein, (ii) the
                                             Assignment of Funding Agreement and
                                             Guarantee set forth in Part IV
                                             herein, (iii) the Acknowledgement
                                             of Funding Agreement and Guarantee
                                             Assignment set forth in Part V
                                             herein, (iv) the Notice of Security
                                             Interest set forth in Part VI
                                             herein, (v) the Trust Certificate
                                             set forth in Part IX herein and
                                             (vi) the Cross-Receipt set forth in
                                             Part XV herein)

                                             By: ________________________
                                             Name: ______________________
                                             Title: _____________________

                                    By:      [CITIBANK, N.A.][indenture trustee
                                             if Citibank, N.A. is not acting as
                                             indenture trustee], in its capacity
                                             as Indenture Trustee, Registrar,
                                             Transfer Agent, Paying Agent and
                                             Calculation Agent (in executing
                                             below agrees and becomes party to
                                             (i) the Instructions of the Trust
                                             set forth in Part I herein, (ii)
                                             the Acknowledgement of Indenture
                                             Trustee Concerning the Notes set
                                             forth in Part II herein, (iii) the
                                             Assignment of Funding Agreement and
                                             Guarantee set forth in Part IV
                                             herein, (iv) the Acknowledgement of
                                             Funding Agreement and Guarantee
                                             Assignment set forth in Part V
                                             herein, (v) the Notice of Security
                                             Interest set forth in Part VI
                                             herein, (vi) the Indenture Trustee
                                             Certification set forth in Part XII
                                             herein and (vii) the Cross Receipt
                                             set forth in Part XV herein)

                                             By: ________________________
                                             Name: ______________________
                                             Title: _____________________

                             [Execution Page 2 of 4]

<PAGE>

                                    By:      U.S. BANK TRUST NATIONAL
                                             ASSOCIATION, in its capacity as
                                             Trustee (in executing below agrees
                                             and becomes a party to the Trustee
                                             Certification set forth in Part
                                             XIII herein)

                                             By: ________________________
                                             Name: ______________________
                                             Title: _____________________

                                    By:      GSS HOLDINGS II, INC., in its
                                             capacity as Trust Beneficial Owner
                                             (in executing below agrees and
                                             becomes a party to the
                                             Cross-Receipt set forth in Part XV
                                             herein)

                                             By: ________________________
                                             Name: ______________________
                                             Title: _____________________

                             [Execution Page 3 of 4]

<PAGE>

                                    By:      BANKERS TRUST COMPANY, N.A., in its
                                             capacity as custodian (in executing
                                             below agrees and becomes a party to
                                             (i) the Certificate Regarding
                                             Custody of the Funding Agreement
                                             and the Guarantee set forth in Part
                                             III herein, (ii) the Assignment of
                                             Funding Agreement and Guarantee set
                                             forth in Part IV herein, (iii) the
                                             Acknowledgment of Funding Agreement
                                             and Guarantee Assignment set forth
                                             in Part V herein, (iv) the Notice
                                             of Security Interest set forth in
                                             Part VI herein and (v) the Cross
                                             Receipt set forth in Part XV
                                             herein)

                                             By: ________________________
                                             Name: ______________________
                                             Title: _____________________

                                    By:      [Name], in his/her capacity as an
                                             authorized officer of Principal
                                             Life (in executing below agrees and
                                             becomes a party to the Principal
                                             Life Officer's Certificate set
                                             forth in Part VII herein)

                                             By: ________________________
                                             Name: ______________________
                                             Title: _____________________

                                    By:      [Name], in his/her capacity as an
                                             authorized officer of PFG (in
                                             executing below agrees and becomes
                                             a party to the PFG Officer's
                                             Certificate set forth in Part VIII
                                             herein)

                                             By: ________________________
                                             Name: ______________________
                                             Title: _____________________

                                    By:      [Purchasing Agent] (in executing
                                             below agrees and becomes a party to
                                             (i) the Instructions of the Trust
                                             set forth in Part I herein and (ii)
                                             the Purchasing Agent Certification
                                             set forth in Part XIV herein)

                                             By: _________________________
                                             Name: _______________________
                                             Title: ______________________

                             [Execution Page 4 of 4]<PAGE>

                                                                    EXHIBIT 4.12

                               CUSTODIAL AGREEMENT

                        THIS CUSTODIAL AGREEMENT (this "CUSTODIAL AGREEMENT") is
entered into as of o, 2006 among Bankers Trust Company, N.A., a national banking
association, acting as custodian (the "CUSTODIAN"), Citibank, N.A. in its
capacity as indenture trustee (the "INDENTURE TRUSTEE") for the holders of the
notes (the "NOTES") to be issued by each trust (each a "TRUST") organized in
connection with the Principal Life Insurance Company Secured Notes Program (the
"PROGRAM"), and U.S. Bank Trust National Association, as trustee (the "TRUSTEE")
on behalf of each Trust organized in connection with the Program.

                        WHEREAS, in connection with the issuance and sale of the
Notes by each Trust, the Trustee, on behalf of each Trust, will purchase
from Principal Life Insurance Company ("PRINCIPAL LIFE") a funding agreement (a
"FUNDING AGREEMENT"), the payment obligations of which are fully and
unconditionally guaranteed by Principal Financial Group, Inc. ("PFG") pursuant
to a guarantee issued to such Trust (the "GUARANTEE");

                        WHEREAS, the parties desire that each Funding Agreement
and Guarantee be held in the State of Iowa at all times prior to the
occurrence and continuance of an Event of Default (as defined in each such
Funding Agreement) or a breach of PFG's obligations under the terms of the
Guarantee;

                        WHEREAS, the parties desire that the Custodian be
appointed as custodian for the Indenture Trustee, to hold in safe custody for
the benefit of the Indenture Trustee, on the terms and conditions provided in
this Custodial Agreement, each Funding Agreement and Guarantee; and

                        WHEREAS, the Custodian has the power and ability
sufficient to undertake and to discharge the duties accepted by it under this
Custodial Agreement;

                        NOW, THEREFORE, in consideration of the foregoing
premises and the covenants contained herein, and for other good and valuable
consideration, the receipt of which are hereby acknowledged, the parties hereto
covenant and agree as follows:

                                   ARTICLE 1
                                   DEFINITIONS

                        SECTION 1.1. Incorporation of Definitions by Reference.
All capitalized terms used herein and not otherwise defined shall have the
meanings ascribed to such terms in the Standard Indenture Terms filed as an
exhibit to the registration statement concerning the Program.

                                   ARTICLE 2
                            APPOINTMENT OF CUSTODIAN

                        SECTION 2.1. Appointment of Custodian. The Indenture
Trustee hereby appoints the Custodian and the Custodian hereby acknowledges that
it will act as custodian for the Indenture Trustee with respect to each Funding
Agreement and Guarantee that is collaterally assigned to the Indenture Trustee
pursuant to the Indenture and with respect to

<PAGE>

each Funding Agreement and each Guarantee in which a security interest is
granted to the Indenture Trustee pursuant to the Indenture, and that comes into
the physical custody or possession of the Custodian under this Custodial
Agreement, until the earlier of (a) such time when the Indenture Trustee
notifies the Custodian in writing to the contrary, whereupon such physical
custody and possession of each Funding Agreement and Guarantee specified in such
notice will be transferred to the Indenture Trustee or another Person in the
manner directed by the Indenture Trustee or (b) the termination of this
Custodial Agreement. Acceptance by the Custodian of this appointment is
conclusively evidenced by its execution of this Custodial Agreement.

                        SECTION 2.2. Custodian Not Subject to Direction of Any
Trust. In no event shall the Custodian, in such custodial role, be construed to
be subject to the direction of the Trustee, on behalf of any Trust, or deliver
any such Funding Agreement or Guarantee to the Trustee, on behalf of any Trust,
without the express written consent of the Indenture Trustee.

                                   ARTICLE 3
                  DELIVERY OF FUNDING AGREEMENTS AND GUARANTEES

                        SECTION 3.1. Delivery of Funding Agreements and
Guarantees. The Indenture Trustee shall, for safekeeping, deposit each Funding
Agreement and Guarantee with and deliver each Funding Agreement and Guarantee
into, or cause each Funding Agreement and Guarantee to be deposited with and
delivered into, the actual, exclusive and continuous possession and control of
the Custodian as custodian for the Indenture Trustee.

                        SECTION 3.2. Limited Interest of Each Trust. Each Trust
shall retain and reserve only such interests, claims or rights in the Funding
Agreements and Guarantees as are set forth herein, in the Indenture or other
such documents as are used (i) to effect the applicable Trust's collateral
assignment of the applicable Funding Agreement and applicable Guarantee to the
Indenture Trustee and to record Principal Life's acknowledgement thereof and
(ii) to grant a security interest in the applicable Funding Agreement and
applicable Guarantee to the Indenture Trustee and to record PFG's and Principal
Life's, respectively, acknowledgement thereof.

                        SECTION 3.3. Security Interest of Indenture Trustee.
Delivery of any Funding Agreement or Guarantee to the Custodian shall, without
any further act or condition, constitute conclusive evidence against the
applicable Trust and all third parties of the Indenture Trustee's security
interest therein.

                        SECTION 3.4. Indenture Trustee Covenant to Abide by
Custodial Agreement. The Indenture Trustee hereby covenants that, at all times
prior to an Event of Default or a breach of PFG's obligation under the Guarantee
and so long as it retains a security interest or other ownership interest in a
Funding Agreement or Guarantee, it will take no action to terminate or to cause
the termination of this Custodial Agreement, and it will abide by the
requirement herein that the physical custody and possession of each such

                                       2
<PAGE>

Funding Agreement and each such Guarantee be at the location provided in Section
9.5 or at such other location within the State of Iowa designated by the
Custodian.

                                   ARTICLE 4
         INSPECTION OF FUNDING AGREEMENTS, GUARANTEES, BOOKS AND RECORDS

                        SECTION 4.1. Inspection of Funding Agreements and
Guarantees. So long as any Notes are Outstanding, the Indenture Trustee and the
Trustee, on behalf of the applicable Trust, by or through their attorneys,
agents or employees, shall each be entitled, but shall be under no obligation,
at any mutually agreeable time, during normal business hours, at the expense of
the applicable Trust, upon two Business Days' notice to the Custodian, to
examine and audit each Funding Agreement and Guarantee held by the Custodian.

                        SECTION 4.2. Inspection of Books and Records. The
Custodian shall maintain appropriate books and records relating to services
performed by it with respect to each Funding Agreement and Guarantee and, so
long as any Notes are Outstanding, the Indenture Trustee and the Trustee, on
behalf of the applicable Trust, by or through their attorneys, agents or
employees, shall each be entitled, but shall be under no obligation, at any
mutually agreeable time, during normal business hours, at the expense of the
applicable Trust, upon two Business Days' notice to the Custodian, to examine
such books and records.

                                   ARTICLE 5
                               DUTIES OF CUSTODIAN

                        SECTION 5.1. General.  The Custodian shall:

              (a)       on behalf of the Indenture Trustee, accept and hold each
                        Funding Agreement and Guarantee in the State of Iowa at
                        its address indicated in Section 9.5 as custodian for
                        the Indenture Trustee, subject to the provisions of this
                        Custodial Agreement, the Indenture and each such Funding
                        Agreement and Guarantee;

              (b)       have and maintain open, continuous and exclusive
                        possession, dominion and control over each Funding
                        Agreement and Guarantee delivered to it under this
                        Custodial Agreement, subject only to the rights and
                        interest of the Indenture Trustee and the applicable
                        Trust;

              (c)       from time to time, certify the receipt of each Funding
                        Agreement and Guarantee as may be reasonably requested
                        by the Indenture Trustee or the Trustee, on behalf of
                        the applicable Trust;

              (d)       from time to time upon request by (i) the Indenture
                        Trustee, or (ii) the Trustee, on behalf of the
                        applicable Trust, and the Indenture Trustee, submit such
                        information and take such action as may be reasonably
                        required by the Trustee, on behalf of the applicable
                        Trust or the Indenture Trustee to assure

                                       3
<PAGE>

                        that each Funding Agreement and Guarantee is maintained
                        in a proper and secure condition;

              (e)       upon receipt of any Funding Agreement or Guarantee,
                        issue to the Indenture Trustee and the applicable Trust
                        a certificate relating to the applicable Funding
                        Agreement and related Guarantee in substantially the
                        form attached as Exhibit A attached hereto, which is
                        made a part hereof;

              (f)       upon its receipt of written notice from the Indenture
                        Trustee that an Event of Default has occurred with
                        respect to any Funding Agreement or a breach of the
                        obligations of PFG under any Guarantee has occurred and
                        at the written direction of the Indenture Trustee,
                        deliver each such Funding Agreement and related
                        Guarantee to the Indenture Trustee;

              (g)       at its own expense, maintain at all times during the
                        term of this Custodial Agreement and keep in full force
                        and effect (i) fidelity insurance, (ii) theft of
                        documents insurance and (iii) forgery insurance;
                        provided, that such insurance shall be in amounts, with
                        standard coverage and subject to deductibles, as are
                        customary for similar insurance typically maintained by
                        financial institutions that act as custodians in similar
                        transactions;

              (h)       unless otherwise specified herein, in providing services
                        hereunder with respect to any Funding Agreement or
                        Guarantee, follow the written instructions received from
                        the Indenture Trustee;

              (i)       exercise reasonable care and diligence, consistent with
                        customary standards for such custody, in the possession,
                        retention and protection of each Funding Agreement and
                        Guarantee delivered to it under this Custodial
                        Agreement;

              (j)       except as otherwise required by applicable law, maintain
                        the confidentiality of the information provided
                        hereunder and in each Funding Agreement and Guarantee,
                        and not disclose or in any way communicate such
                        information to third parties without the express written
                        consent of the Trustee, on behalf of the applicable
                        Trust (provided, however, that notwithstanding anything
                        herein to the contrary and except as reasonably
                        necessary to comply with any applicable federal and
                        state securities laws, the Custodian (and each employee,
                        representative or other agent of the Custodian) may
                        disclose to any and all persons, without limitation of
                        any kind, the U.S. federal and state income tax
                        treatment and tax structure of the transaction and all
                        materials of any kind (including opinions or other tax
                        analyses) that are provided to the Custodian relating to
                        such U.S. federal and state income tax treatment and tax
                        structure, where "tax structure" is any fact that may be
                        relevant to understanding the U.S. federal or state
                        income tax treatment of the transaction);

                                       4
<PAGE>

              (k)       request written direction from the Indenture Trustee and
                        rely upon such written direction in the event that (i)
                        any dispute shall arise between the parties with respect
                        to the disposition of any Funding Agreement or Guarantee
                        held hereunder or (ii) the Custodian shall be uncertain
                        as to how to proceed in a situation not explicitly
                        addressed by the terms of this Custodial Agreement
                        whether because of conflicting demands by the other
                        parties hereto or otherwise; and

              (l)       have only those duties as are specifically provided
                        herein, which shall be deemed purely ministerial in
                        nature, and shall under no circumstance be deemed a
                        fiduciary for any of the parties to this Custodial
                        Agreement.

                        SECTION 5.2. Merger, Conversion or Consolidation of
Custodian. Notwithstanding anything herein to the contrary, any banking
association or corporation into which the Custodian may be merged, converted or
with which the Custodian may be consolidated, or any corporation resulting from
any merger, conversion or consolidation to which the Custodian shall be a party,
or any banking association or corporation to which all or substantially all of
the corporate trust business of the Custodian shall be transferred, shall
succeed to all the Custodian's rights, obligations and immunities hereunder
without the execution or filing of any paper or any further act on the part of
any of the parties hereto.

                        SECTION 5.3. Compliance with Writs, Orders or Decrees.
In the event that any Funding Agreement or Guarantee shall be attached,
garnished or levied upon by any court order, or the delivery thereof shall be
stayed or enjoined by an order of a court, or any order, judgment or decree
shall be made or entered by any court order affecting the property deposited
under this Custodial Agreement, the Custodian is hereby expressly authorized, in
its sole discretion, to obey and comply with all writs, orders or decrees so
entered or issued, which it is advised by legal counsel of its own choosing is
binding upon it, whether with or without jurisdiction, and in the event the
Custodian obeys or complies with any such writ, order or decree it shall not be
liable to any of the parties hereto or to any other Person, firm or corporation
by reason of such compliance notwithstanding such writ, order or decree be
subsequently reversed, modified, annulled, set aside or vacated.

                        SECTION 5.4. Delegation of Duties. The Custodian shall
not employ any third party institution to carry out any of the services to be
provided hereunder without the express written consent of the Indenture Trustee,
which consent shall not be unreasonably withheld.

                        SECTION 5.5. No Constructive Knowledge. The Custodian
shall not be deemed to have knowledge of the occurrence of a Default or Event of
Default unless the Custodian receives a written notice of such Default or Event
of Default from the Indenture Trustee or the Trustee, on behalf of the
applicable Trust.

                        SECTION 5.6. Reliance. In performance of its duties
under this Custodial Agreement, the Custodian shall be permitted to rely on any
certificate, instrument, document or communication believed by it to be genuine,
correct and signed by the proper

                                       5
<PAGE>

Person or Persons. The Trustee, on behalf of the applicable Trust, and the
Indenture Trustee shall each execute and deliver to the Custodian a certificate
of incumbency for the purpose of establishing the identity of the
representatives of the Trustee, on behalf of the applicable Trust, and the
Indenture Trustee, respectively, entitled to issue instructions or directions to
the Custodian on behalf of each such party. In the event of any change in the
identity of such representatives, a new certificate of incumbency shall be
executed and delivered to the Custodian by the appropriate party. Until such
time as the Custodian shall receive a new incumbency certificate, the Custodian
shall be fully protected in relying without inquiry on any then current
incumbency certificate on file with the Custodian.

                        SECTION 5.7. Release of Funding Agreements and
Guarantees. Except as consented to by the Indenture Trustee or as otherwise
provided in the Indenture and this Custodial Agreement, the Custodian shall not
release any Funding Agreement or Guarantee from its possession without receiving
a prior written request duly executed on behalf of the Indenture Trustee.

                        SECTION 5.8. Limitations of Custodian Responsibility.

              (a)       The Custodian assumes no responsibility under this
                        Custodial Agreement other than to render the services
                        contemplated hereunder.

              (b)       The Custodian assumes no responsibility for the
                        effectiveness, genuineness, validity or enforceability
                        of any Funding Agreement or Guarantee in its custody or
                        for making any inquiry into any such Funding Agreement
                        or Guarantee.

              (c)       The Custodian shall not be liable or deemed to be in
                        default for any failure or delay in performance of any
                        duty in whole or in part arising out of or caused by any
                        of the following: a major external flood; earthquake;
                        "act of God;" failure of public utility; act of war; act
                        of terrorism; or rebellion or revolution in the United
                        States.

                        SECTION 5.9. Other Activities of the Custodian.

              (a)       Nothing herein shall prevent the Custodian or any of its
                        Affiliates from engaging in other businesses, or from
                        rendering services of any kind to any Trust, the
                        Indenture Trustee or any other Person or entity to the
                        extent permitted by applicable law.

              (b)       It is understood that the Custodian and any of its
                        Affiliates may engage in any other business and furnish
                        custodial services to others.

              (c)       The Custodian will be free, in its sole discretion, to
                        effect transactions on behalf of itself or for others,
                        which may be the same as or different from those
                        effected under this Custodial Agreement.

                                       6
<PAGE>

              (d)       The Custodian shall have the right, but not the
                        obligation to consult with counsel of its choice and
                        shall not be liable for action taken or omitted to be
                        taken by the Custodian either in accordance with the
                        advice of such counsel or in accordance with any opinion
                        of counsel to any Trust addressed and delivered to the
                        Custodian.

                                   ARTICLE 6
                   COMPENSATION, EXPENSES AND INDEMNIFICATION

                        SECTION 6.1. Compensation, Expenses and Indemnification.
The Custodian shall be entitled to compensation, expenses and indemnification as
set forth in that certain Expense and Indemnity Agreement (the "EXPENSE AND
INDEMNITY AGREEMENT"), dated as of o, 2006 entered into between the Custodian
and Principal Life.

                                    ARTICLE 7
             REPRESENTATIONS, WARRANTIES AND COVENANTS OF CUSTODIAN

                        SECTION 7.1. Representations and Warranties of
Custodian. The Custodian hereby represents and warrants to the Indenture Trustee
and the Trustee, for the benefit of each Trust, that:

              (a)       it is a national banking association duly organized and
                        validly existing and in good standing under the laws of
                        the State of Iowa and has full power and authority to
                        own its assets and to transact the business in which it
                        is currently engaged and is duly qualified and in good
                        standing under the laws of each jurisdiction where its
                        ownership or lease of property or the conduct of its
                        business requires, or the performance of this Custodial
                        Agreement would require, such qualification;

              (b)       it, and each Person acting on its behalf, has full power
                        and authority to execute and deliver this Custodial
                        Agreement and to perform all of its obligations under
                        this Custodial Agreement; and

              (c)       this Custodial Agreement, and each instrument and
                        document required hereunder that was executed and
                        delivered by, or on behalf of, the Custodian, has been
                        executed and delivered by a duly authorized officer of
                        the Custodian.

                        SECTION 7.2. Covenants of Custodian. The Custodian
hereby covenants to the Indenture Trustee and the Trustee, for the benefit of
each Trust, that:

              (a)       at all times it will maintain physical custody and
                        possession of each Funding Agreement and Guarantee
                        deposited with it pursuant to the terms of this
                        Custodial Agreement within the State of Iowa at the
                        location specified in Section 9.5 or at such other
                        location within the State of Iowa designated by the
                        Custodian;

                                       7
<PAGE>

              (b)       each instrument and document required to be executed or
                        delivered by, or on behalf of, the Custodian, shall be
                        executed and delivered by a duly authorized officer of
                        the Custodian;

              (c)       prior to any affiliation with any Trust in the future,
                        it shall notify the Indenture Trustee of any such
                        contemplated affiliation; and

              (d)       it shall not institute, or join any other Person in
                        instituting, against any Trust any bankruptcy,
                        reorganization, arrangement, insolvency, moratorium or
                        liquidation proceedings or other proceedings under
                        federal or state bankruptcy or similar laws until at
                        least one year and one day (or, if longer, the
                        applicable preference period then in effect) after the
                        payment in full of all Notes issued by any Trust in
                        connection with the Program.

                                   ARTICLE 8
                                   TERMINATION

                        SECTION 8.1. General. This Custodial Agreement and the
duties and responsibilities of the Custodian hereunder shall remain in effect
until the occurrence of one or more of the following events:

              (a)       delivery to the Custodian by the Indenture Trustee of a
                        written certification signed by the Indenture Trustee
                        that each Trust organized in connection with the Program
                        has paid and discharged all obligations with respect to
                        the Notes issued by each such Trust and that the Program
                        has been terminated;

              (b)       termination of each Indenture entered into by each Trust
                        organized in connection with the Program, and delivery
                        by the Custodian of each Funding Agreement and Guarantee
                        in its possession hereunder to the Indenture Trustee or
                        as the Indenture Trustee shall direct in writing and
                        certification by the Indenture Trustee that the Program
                        has been terminated; or

              (c)       termination of this Custodial Agreement pursuant to
                        Section 8.2, 8.3 or 8.4.

                        SECTION 8.2. Termination by Custodian. This Custodial
Agreement may be terminated by the Custodian, at any time, and the Custodian may
resign, upon 30 days' prior written notice to the Trustee, on behalf of each
Trust and the Indenture Trustee; provided, however, that no termination or
resignation pursuant to this Section 8.2 shall be effective until the date as of
which a successor Custodian shall be appointed in accordance with Section 8.6
and shall have agreed in writing to assume all of the Custodian's duties and
obligations under this Custodial Agreement.

                        SECTION 8.3. Termination by Indenture Trustee Without
Cause. This Custodial Agreement may be terminated at any time by the Indenture
Trustee, without cause, and the Indenture Trustee may remove the Custodian, upon
30 days' prior written notice to the Custodian and each Trust (or such shorter
notice as is acceptable to the

                                       8
<PAGE>

Custodian and each Trust); provided, however, that no termination or removal
pursuant to this Section 8.3 shall be effective until the date as of which a
successor Custodian shall be appointed in accordance with Section 8.6 and shall
have agreed in writing to assume all of the Custodian's duties and obligations
under this Custodial Agreement.

                        SECTION 8.4. Termination by Indenture Trustee for Cause.
This Custodial Agreement may be terminated at any time by the Indenture Trustee,
for cause, and the Indenture Trustee may remove the Custodian, upon 10 days'
prior written notice to the Custodian; provided, however, that no termination or
removal pursuant to this Section 8.4 shall be effective until the date as of
which a successor Custodian shall be appointed in accordance with Section 8.6
and shall have agreed in writing to assume all of the Custodian's duties and
obligations under this Custodial Agreement. For purposes of determining "cause"
with respect to any such termination of this Custodial Agreement, such term
shall mean any one of the following events:

              (a)       the Custodian willfully violates, or takes any action
                        that it knows materially breaches, any provision of this
                        Custodial Agreement;

              (b)       the Custodian materially breaches in any respect any
                        provision of this Custodial Agreement (other than as
                        specified in paragraph (a) of this Section 8.4) and
                        fails to cure such breach within 30 days of its becoming
                        aware, or its receiving notice from the Indenture
                        Trustee, of such breach;

              (c)       the Custodian is wound up or dissolved or there is
                        appointed over it, or a substantial portion of its
                        assets, a receiver, administrator, administrative
                        receiver, trustee or similar officer;

              (d)       the Custodian (i) ceases to be able to, or admits in
                        writing its inability to, pay its debts as they become
                        due and payable, or makes a general assignment for the
                        benefit of, or enters into any composition or
                        arrangement with, its creditors generally; (ii) applies
                        for or consents to the appointment of a receiver,
                        trustee, assignee, custodian, liquidator or sequestrator
                        (or other similar official) of the Custodian or of any
                        substantial part of its properties or assets, or
                        authorizes such an application or consent, or
                        proceedings seeking such appointment are commenced
                        without such authorization, consent or application
                        against the Custodian and continue undismissed for 60
                        days; (iii) authorizes or files a voluntary petition in
                        bankruptcy, or applies for or consents to the
                        application of any bankruptcy, reorganization,
                        arrangement, readjustment of debt, insolvency or
                        dissolution, or authorizes such application or consent,
                        or proceedings to such end are instituted against the
                        Custodian without such authorization, application or
                        consent and are approved as properly instituted and
                        remain undismissed for 60 days or result in adjudication
                        of bankruptcy or insolvency; (iv) permits or suffers all
                        or any substantial part of its properties or assets to
                        be sequestered or attached by court order and such order
                        remains undismissed for 60 days; or (v) engages in any
                        activity analogous

                                       9
<PAGE>

                        to the activities set forth in clauses (i) through (iv)
                        of this Section 8.4(d) in any applicable jurisdiction;
                        or

              (e)       the occurrence of an act by the Custodian that
                        constitutes fraud or criminal activity in the
                        performance of its obligations under this Custodial
                        Agreement, or the Custodian being convicted of a
                        criminal offense materially related to its primary
                        businesses.

                        SECTION 8.5. Liabilities After Termination. If this
Custodial Agreement is terminated as provided herein, none of the parties hereto
shall have any further liability or obligation to the other parties hereto,
except as provided in Sections 5.1(j), 8.6, 8.7 and 8.8 of this Custodial
Agreement.

                        SECTION 8.6. Appointment of Successor Custodian. Any
removal or resignation of the Custodian while any Notes are Outstanding will be
effective only upon the appointment by the Indenture Trustee (and the acceptance
in writing by such successor Custodian) of a successor Custodian that is an
established institution in the State of Iowa which (a) has demonstrated an
ability to professionally and competently perform duties similar to those
imposed upon the Custodian hereunder and (b) is legally qualified and has the
capacity to act as Custodian hereunder in the assumption of all of the
responsibilities, duties and obligations of the Custodian hereunder. The
Trustee, on behalf of each Trust, the Indenture Trustee, the Custodian and the
successor Custodian shall take such action (or cause the removed or resigning
Custodian to take such action) consistent with this Custodial Agreement as shall
be necessary to effectuate any such succession.

                        SECTION 8.7. Rights and Remedies of Indenture Trustee
Regarding Termination. In the event of removal of the Custodian pursuant to this
Custodial Agreement by the Indenture Trustee, the Indenture Trustee shall have
all of the rights and remedies available with respect thereto at law or equity,
and, without limiting the foregoing, the Indenture Trustee may by notice in
writing to the Custodian as provided under this Custodial Agreement terminate
all the rights and obligations of the Custodian under this Custodial Agreement
(except those that survive termination pursuant to Section 8.5). Upon the
expiration of any applicable notice period with respect to termination of this
Custodial Agreement, all authority and power of the Custodian under this
Custodial Agreement, whether with respect to each Funding Agreement or Guarantee
or otherwise, shall automatically and without further action by any Person or
entity pass to and be vested in the successor Custodian upon the appointment
thereof and the agreement of such successor Custodian to assume the Custodian's
duties and obligations under this Custodial Agreement.

                        SECTION 8.8. Actions Upon Termination.

              (a)       Upon the effective date of termination of this Custodial
                        Agreement, the Custodian shall, as soon as practicable:

                        (i)       deliver to the Indenture Trustee, the
                                  successor Custodian or to such other Person as
                                  the Indenture Trustee directs in writing all
                                  Funding

                                       10
<PAGE>

                                  Agreements and Guarantees then in the custody
                                  of the Custodian; and

                        (ii)      deliver to the Indenture Trustee or successor
                                  Custodian an accounting with respect to the
                                  books and records relating to each Funding
                                  Agreement and Guarantee that was delivered to
                                  the Custodian.

              (b)       Notwithstanding any such termination, the Custodian
                        shall remain liable to the extent set forth herein (but
                        subject to Section 8.6) for its acts or omissions
                        hereunder arising prior to termination and for any
                        expenses, losses, claims, damages, judgments,
                        assessments, costs or other liabilities (including
                        reasonable attorneys' fees) in respect of or arising out
                        of a material breach of the representations, warranties
                        or covenants made by the Custodian under this Custodial
                        Agreement or from any failure of the Custodian to comply
                        with the provisions of this Section 8.8.

              (c)       The Custodian agrees that, notwithstanding any
                        termination, it shall reasonably cooperate in any
                        proceeding arising in connection with this Custodial
                        Agreement, the Indenture or any Funding Agreement or
                        Guarantee upon receipt of appropriate indemnification
                        and expense reimbursement.

                                   ARTICLE 9
                               GENERAL PROVISIONS

                        SECTION 9.1. Binding Effect; Successors, Transferees and
Assigns. This Custodial Agreement shall be binding upon the parties hereto,
their respective successors, transferees and assigns, and shall inure the
benefit of and be enforceable by all parties hereto and their respective
successors, transferees and permissible assigns.

                        SECTION 9.2. Amendments. This Custodial Agreement may
not be amended without the express written consent of the Custodian, the
Indenture Trustee and the Trustee acting on behalf of each Trust.

                        SECTION 9.3. Assignment of Funding Agreements and
Guarantees. No collateral assignment, grant of security interest or similar
action by, or on behalf of, any Trust of any Funding Agreement or Guarantee
shall be recognized by the Custodian or be effective unless approved in writing
by the Indenture Trustee.

                        SECTION 9.4. Notices. All notices, requests and other
communications under this Custodial Agreement shall be in writing (including
bank wire, facsimile or similar writing) and shall be given to the relevant
Person at its address or facsimile number set forth below or such other address
or facsimile number as such Person may hereafter specify for such purpose by not
less than 10 Business Days' prior notice to each other Person specified in this
Section 9.4. Each such notice, request or other communication shall be effective
(a) if given by facsimile, when such facsimile is transmitted to the

                                       11
<PAGE>

facsimile number specified pursuant to this Section 9.4, (b) if given by mail,
48 hours after such communication is deposited in the mails with first class
postage prepaid, or (c) if given by any other means, when delivered or received
at the address specified in this Section 9.4.

                        Such notices, requests and other communications shall be
addressed, if to the Trust, to:

                        Principal Life Income Fundings Trust
                        c/o U.S. Bank Trust National Association, as Trustee
                        100 Wall Street, 16th Floor
                        New York, New York 10005
                        Attention: Adam Berman
                        Facsimile: 212-509-3384

                        if to the Indenture Trustee, to:

                        Citibank, N.A.
                        Citibank Agency & Trust
                        388 Greenwich Street, 14th Floor
                        New York, New York   10013
                        Attention:  Nancy Forte
                        Facsimile: 212-816-5527

                        if to the Trustee, to:

                        U.S. Bank Trust National Association
                        100 Wall Street, 16th Floor
                        New York, New York 10005
                        Attention: Adam Berman
                        Facsimile: 212-509-3384

                        SECTION 9.5. Address of Custodian. The Custodian shall
hold each Funding Agreement and Guarantee at the following address:

                        Bankers Trust Company, N.A.
                        453 7th Street
                        Des Moines, Iowa  50309-2728
                        Attention:  Angela C. Brick
                        Facsimile: 515-247-2101

                        SECTION 9.6. Waiver of Certain Rights. The Custodian
hereby waives, relinquishes and releases any rights which it may have by way of
contract or law, whether through exercise of a right of set-off, security
interest, counterclaim or otherwise, to obtain any property or payment from,
under or with respect to any Funding Agreement or Guarantee delivered to it
hereunder.

                                       12
<PAGE>

                        SECTION 9.7. Provisions Separable. Any provision of this
Custodial Agreement which is prohibited, unenforceable or not authorized in any
jurisdiction shall, as to such jurisdiction, be ineffective to the extent of
such prohibition, unenforceability or non-authorization without invalidating the
remaining provisions hereof or affecting the validity or enforceability or
legality of such provision in any other jurisdiction.

                        SECTION 9.8. Governing Law. This Custodial Agreement
shall be governed by and construed in accordance with the laws of the State of
New York, without regard to its choice of law principles.

                        SECTION 9.9. Waiver of Jury Trial. Each of the parties
to this Custodial Agreement hereby irrevocably waives any and all right to a
trial by jury with respect to any legal proceeding arising out of or relating to
this or any related transaction.

                        SECTION 9.10. Headings Not to Affect Interpretation. The
headings contained in this Custodial Agreement are for convenience only, and
they neither form a part of this Custodial Agreement nor are they to be used in
the construction or interpretation hereof.

                        SECTION 9.11. Counterparts. This Custodial Agreement may
be executed and delivered in any number of counterparts, each of which, when so
executed and delivered, shall be an original; provided, however, that such
counterparts shall together constitute but one and the same instrument.

                                       13
<PAGE>

             IN WITNESS WHEREOF, the parties have caused this Custodial
Agreement to be duly executed by their respective authorized officers, as of the
date first above written.

                                       BANKERS TRUST COMPANY, N.A., as Custodian

                                       By:
                                          --------------------------------------
                                          Name: Angela C. Brick
                                          Title:  Vice President

                                       CITIBANK, N.A., as Indenture Trustee for
                                       the benefit of the holders of the Notes
                                       issued in connection with the Program

                                       By:
                                          --------------------------------------
                                          Name:
                                          Title:

                                       U.S. BANK TRUST NATIONAL
                                       ASSOCIATION, as Trustee, on behalf of
                                       each Trust organized in connection with
                                       the Program

                                       By:
                                          --------------------------------------
                                          Name:
                                          Title:

                                       14
<PAGE>

                                                                       EXHIBIT A

                      CERTIFICATE REGARDING CUSTODY OF THE
                       FUNDING AGREEMENT AND THE GUARANTEE

            In connection with the issuance of the Funding Agreement, the
Assignment of Funding Agreement (set forth in Part IV of the Closing Instrument
(as defined in the Omnibus Instrument)) and the issuance of the Guarantee, the
Custodian hereby represents that it has received delivery of the Funding
Agreement and the Guarantee and is holding the Funding Agreement and the
Guarantee for the benefit of the Indenture Trustee and that the Funding
Agreement and the Guarantee are in the possession of the Custodian at the
address below:

            Bankers Trust Company, N.A.
            665 Locust Street
            Des Moines, Iowa 50309-3702

                                      A-1

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