Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_68 (marriage VARCHAR, became_duchess VARCHAR)
### Question:
Which Marriage has a Became Duchess of 12 december 1666?
### Answer:
SELECT marriage FROM table_name_68 WHERE became_duchess = "12 december 1666"