Background
He was the third son of Sir Edward Knatchbull, 4th Baronet and Alice Wyndham, daughter of Colonel John Wyndham.
He was the third son of Sir Edward Knatchbull, 4th Baronet and Alice Wyndham, daughter of Colonel John Wyndham.
Knatchbull married Grace Legge, second daughter of William Legge. He died, aged 84, and was succeeded in the baronetcy by his only surviving son Edward.
Knatchbull was a Member of Parliament (Member of Parliament) for Armagh Borough in the Irish House of Commons from 1727 until 1760.