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_79 (marriage VARCHAR, became_dauphine VARCHAR)
### Question:
when was the marriage when became dauphine is 31 august 1412?
### Answer:
SELECT marriage FROM table_name_79 WHERE became_dauphine = "31 august 1412"