Below is an instruction that describes a task. Write a response that appropriately completes the request.

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

### Inputs:
table_name: table, columns: ['Name', 'Father', 'Birth', 'Marriage', 'Became Duchess', 'Ceased to be Duchess', 'Death', 'Spouse']

### Response:
SELECT Birth FROM table WHERE Marriage = 11 july 1643