Table:
0
A
B
C
D
E
F
1
Name
Birth
Marriage
Became Consort
Ceased to be Consort
Spouse
2
Amalia of Oldenburg
21 December 1818
22 November 1836
23 October 1862 husband's desposition
26 July 1867 husband's death
Otto
3
Gisela of Austria
12 July 1856
20 April 1873
12 December 1912 husband's accession
28 September 1930 husband's death
Prince Leopold of Bavaria
4
Bona Margherita of Savoy
1 August 1896
8 January 1921
31 May 1943 husband's accession
6 September 1969 husband's death
Prince Konrad of Bavaria
5
Helene von Khevenhüller-Metsch
4 April 1921
16 November 1970
16 November 1970
1 January 1997 husband's death
Prince Eugen of Bavaria
6
Disputed
Disputed
Disputed
Disputed
Disputed
Disputed

Questions and formulas:
Question: Who had a disputed marriage?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:F1,C1="disputed"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:F6,C2:C6="disputed"),1))
Level: medium