Table:
0
A
B
C
D
E
F
1
Birth
Marriage
Became Duchess
Ceased to be Duchess
Death
Spouse
2
11 December 1455
4 June 1474
21 July 1495 Created Duchess
24 February 1496 husband's death
30 May 1503
Eberhard I
3
29 October 1451
April/May 1467
24 February 1496 husband's accession
11 June 1498 husband's death
28 March 1524
Eberhard II
4
24 April 1492
2 March 1511
2 March 1511
January 1519 husband's desposition
30 August 1564
Ulrich
5
Württemberg annexed by Austria 1519–1534.
Württemberg annexed by Austria 1519–1534.
Württemberg annexed by Austria 1519–1534.
Württemberg annexed by Austria 1519–1534.
Württemberg annexed by Austria 1519–1534.
Württemberg annexed by Austria 1519–1534.
6
24 April 1492
2 March 1511
May 1534 husband's restoration
6 November 1550 husband's death
30 August 1564
Ulrich
7
28 December 1526
24 February 1544
6 November 1550 husband's accession
28 December 1568 husband's death
20 May 1589
Christoph
8
20 June 1559
7 November 1575
7 November 1575
19 May 1583
19 May 1583
Louis III
9
24 February 1572
10 May 1585
10 May 1585
18 August 1593 husband's death
15 February 1635
Louis III
10
28 September 1564
22 May 1581
18 August 1593 husband's accession
29 January 1608 husband's death
26 October 1614
Frederick I
11
16 November 1584
5 November 1609
5 November 1609
18 July 1628 husband's death
13 February 1636
John Frederick
12
27 January 1614
26 February 1637
26 February 1637
27 June 1655
27 June 1655
Eberhard III
13
29 December 1639
20 July 1656
20 July 1656
2 July 1674 husband's death
29 June 1698
Eberhard III
14
28 April 1652
6 November 1673
2 July 1674 husband's accession
23 June 1677 husband's death
11 August 1712
William Louis
15
3 October 1680
6/16 May 1697
6/16 May 1697
31 October 1733 husband's death
2 July 1757
Eberhard Louis
16
11 August 1706
1 May 1727
31 October 1733 husband's accession
12 March 1737 husband's death
1 February 1756
Charles Alexander
17
30 August 1732
26 September 1748
26 September 1748
6 April 1780
6 April 1780
Charles Eugene
18
18 December 1736
2 November 1753
20 May 1795 husband's accession
23 December 1797 husband's death
9 March 1798
Frederick II Eugene
19
29 September 1766
18 May 1797
23 December 1797 husband's accession
25 February 1803 elevated from Electress
5 October 1828
Frederick III

Questions and formulas:
Question: What is the Birth of the lady that has a Became Duchess on 18 august 1593 husband's accession?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,C1="18 august 1593 husband's accession"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F19,C2:C19="18 august 1593 husband's accession"),1))
Level: medium
Question: Who is the Spouse of the Duchess that has a Birth on 29 october 1451?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,A1="29 october 1451"),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F19,A2:A19="29 october 1451"),6))
Level: medium
Question: Who is The Spouse of the Duchess that has a Became Duchess  on 31 october 1733 husband's accession?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,C1="31 october 1733 husband's accession"),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F19,C2:C19="31 october 1733 husband's accession"),6))
Level: medium
Question: WHo Became Duchess that has a Death of 26 october 1614?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,E1="26 october 1614"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F19,E2:E19="26 october 1614"),3))
Level: medium
Question: What is the Spouse of the Duchess that has a Death on 6 april 1780?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,E1="6 april 1780"),6))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F19,E2:E19="6 april 1780"),6))
Level: medium