Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_name_12 ( birth VARCHAR, marriage VARCHAR )

### Question ###
When was the duchess, who was married on 11 july 1643, born?

### Accurate SQL ###

SELECT birth FROM table_name_12 WHERE marriage = "11 july 1643"