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

### Instruction:
When was the marriage of the person who died on 17 December 1471?

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

### Response:
SELECT Marriage FROM table WHERE Death = 17 december 1471