user: Question: When did the person who died on 6 Dec 1240 get married?
Columns: ['Father', 'Birth', 'Marriage', 'Became Queen', 'Ceased to be Queen', 'Death', 'Spouse']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Otto II, Margrave of Meissen', '1160+', '1178', '1198', '1199', '2 Feb 1211', 'Ottokar I']
SQL:

assistant: SELECT "Marriage" FROM "Table" WHERE "Death" = '6 Dec 1240';