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

### Instruction:
Who was the 1st member with 2nd member Thomas Leigh and was elected in 1557/58?

### Inputs:
table_name: table, columns: ['Summoned', 'Elected', 'Assembled', 'Dissolved', '1st member', '2nd member']

### Response:
SELECT 1st member FROM table WHERE 2nd member = thomas leigh AND Elected = 1557/58