Table:
0
A
B
C
D
E
F
G
1
Name
Birth
Marriage
Became Duchess
Ceased to be Duchess
Death
Spouse
2
Maria Josepha of Bavaria
30 March 1739
23 January 1765
18 August 1765 husband's accession
7/8 April 1766 Title passed to sister-in-law
28 May 1767
Joseph II
3
Archduchess Maria Christina of Austria , Suo jure
13 May 1742
7/8 April 1766
7/8 April 1766
24 June 1798
24 June 1798
Albert I
4
Princess Henrietta of Nassau-Weilburg
30 October 1797
15/17 September 1815
10 February 1822 husband's accession
29 December 1829
29 December 1829
Charles II
5
Princess Hildegard of Bavaria
10 June 1825
1 May 1844
30 April 1847 husband's accession
2 April 1864
2 April 1864
Albert II
6
Princess Isabella of Croÿ
27 February 1856
8 October 1878
18 February 1895 husband's accession
1918 Monarchy abolished
5 September 1931
Frederick

Questions and formulas:
Question: Which member of house of Habsburg-Lorraine had the spouse Charles II?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,G1="charles ii"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,G2:G6="charles ii"),1))
Level: medium
Question: What is the marriage date for the Habsburg-Lorraine house member who died 29 December 1829?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,F1="29 december 1829"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,F2:F6="29 december 1829"),3))
Level: medium
Question: When did the duchess who became duchess on 7/8 April 1766 cease to be duchess?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,D1="7/8 april 1766"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,D2:D6="7/8 april 1766"),5))
Level: medium
Question: What is the date of death of the duchess born on 30 October 1797?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,B1="30 october 1797"),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,B2:B6="30 october 1797"),6))
Level: medium
Question: What is the birth date of the duchess who married on 1 May 1844?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:G1,C1="1 may 1844"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:G6,C2:C6="1 may 1844"),2))
Level: medium