Question: Who is the paternal grandmother of Mervyn Tuchet, 4Th Earl Of Castlehaven?

Knowledge 1: Mervyn Tuchet, 4th Earl of Castlehaven
Mervyn Tuchet, 4th Earl of Castlehaven (died 2 November 1686) was the third son of Mervyn Tuchet, 2nd Earl of Castlehaven, and his first wife, Elizabeth Barnham (1592 – c. 1622).He married Mary Talbot (buried 15 March 1710/1), daughter of John Talbot, 10th Earl of Shrewsbury (bef.1601–1654) and his wife, née Mary Fortesque.They had at least three children:He succeeded his brother James as Earl of Castlehaven on 11 October 1684.He also held the lower titles 14th Baron Audley and 2nd Baron Audley of Hely.On his death, his titles passed to his son James. [SEP] Knowledge 2: Mervyn Tuchet, 2nd Earl of Castlehaven
Mervyn Tuchet (sometimes Mervin Touchet), 2nd Earl of Castlehaven (1593 – 14 May 1631), was an English nobleman who was convicted of rape and sodomy and subsequently executed.A son of George Tuchet, 1st Earl of Castlehaven and 11th Baron Audley, by his wife, Lucy Mervyn, he was known by the courtesy title of Lord Audley during his father's lifetime, so is sometimes referred to as Mervyn Audley.He was knighted by James I in 1608, before he studied law at the Middle Temple.He served as Member of the Parliament of England for Dorset in the Addled Parliament of 1614 and was a Justice of the Peace for the counties of Dorset, Somerset, and Wiltshire.He succeeded his father on 20 February 1616/7 as Earl of Castlehaven and Baron Audley.He left seven children upon his death.Sometime before 1612 (records of the marriage are lacking), Lord Audley married Elizabeth Barnham, a sister-in-law of the philosopher and scientist Francis Bacon, and with her he had six children.By all accounts the marriage was a loving and successful one, ending with her death in 1622.His second marriage, on 22 July 1624, at Harefield, Middlesex, was to the former Lady Anne Stanley (1580–1647), elder daughter and co-heiress of Ferdinando Stanley, 5th Earl of Derby (by his wife, Alice Spencer), and widow of Grey Brydges, 5th Baron Chandos.They had a daughter, Anne Touchet, who died young.Lady Anne was significantly older than Castlehaven, and the marriage was not a success, but in 1628 Lord Castlehaven's son was married to her thirteen-year-old daughter, Elizabeth; a marriage of step-children.
Knowledge 1: Mervyn Tuchet, 4th Earl of Castlehaven
Mervyn Tuchet, 4th Earl of Castlehaven (died 2 November 1686) was the third son of Mervyn Tuchet, 2nd Earl of Castlehaven, and his first wife, Elizabeth Barnham (1592 – c. 1622).He married Mary Talbot (buried 15 March 1710/1), daughter of John Talbot, 10th Earl of Shrewsbury (bef.1601–1654) and his wife, née Mary Fortesque.They had at least three children:He succeeded his brother James as Earl of Castlehaven on 11 October 1684.He also held the lower titles 14th Baron Audley and 2nd Baron Audley of Hely.On his death, his titles passed to his son James. [SEP] Knowledge 2: George Anselm Touchet
George Anselm Touchet, also spelt Tuchet,( died 1689 or earlier) was the Roman Catholic chaplain of Queen Catherine of Braganza, the wife of King Charles II.The second son of Mervyn Tuchet, 2nd Earl of Castlehaven, by his marriage to Elizabeth Barnham, and a younger brother of James Tuchet, 3rd Earl of Castlehaven, Touchet began life as George Tuchet in Stalbridge, Dorset.In 1631, his father was convicted and executed for various sexual crimes, including rape and sodomy.In 1643 Touchet became a Benedictine monk at St Gregory's, Douai, and was clothed a monk under the name of Anselm.After the Restoration of the Stuarts he was made chaplain to Queen Catherine, with an apartment at St James's Palace and subsequently another at Somerset House, and with an allowance of £ 100 a year.Touchet's" Historical collections", a work of Catholic controversy, appeared in 1674, and he was banished from England the following year.In 1682 he was debarred by an Act of Parliament from succeeding to his brother's earldom and estates.An abridged version of his manuscript translation of a devotional work by the French mystic Constantine Barbanson( 1581 –1632) was published in 1928 as" The Secret Paths of Divine Love".
Knowledge 1: Mervyn Tuchet, 4th Earl of Castlehaven
Mervyn Tuchet, 4th Earl of Castlehaven (died 2 November 1686) was the third son of Mervyn Tuchet, 2nd Earl of Castlehaven, and his first wife, Elizabeth Barnham (1592 – c. 1622).He married Mary Talbot (buried 15 March 1710/1), daughter of John Talbot, 10th Earl of Shrewsbury (bef.1601–1654) and his wife, née Mary Fortesque.They had at least three children:He succeeded his brother James as Earl of Castlehaven on 11 October 1684.He also held the lower titles 14th Baron Audley and 2nd Baron Audley of Hely.On his death, his titles passed to his son James. [SEP] Knowledge 2: James Tuchet, 3rd Earl of Castlehaven
James Tuchet, 3rd Earl of Castlehaven( c. 1617 – 11 October 1684) was the son of Mervyn Tuchet, 2nd Earl of Castlehaven and his first wife, Elizabeth Barnham( 1592 – c. 1622).Castlehaven played a prominent role in the Wars of the Three Kingdoms that took place in the middle of the 17th century, and was particularly active in the conflicts in Ireland at this time.

Answer: Lucy Mervyn