Background
He was the son of John Fitzwilliam, 2nd Earl Fitzwilliam by his wife Anne, daughter of John Stringer of Sutton cum Lound, Nottinghamshire. He succeeded his father as third Earl Fitzwilliam in the Peerage of Ireland on 28 August 1728.
He was the son of John Fitzwilliam, 2nd Earl Fitzwilliam by his wife Anne, daughter of John Stringer of Sutton cum Lound, Nottinghamshire. He succeeded his father as third Earl Fitzwilliam in the Peerage of Ireland on 28 August 1728.
On 22 June 1744 at Street George"s, Hanover Square, Lord Fitzwilliam was married to Lady Anne Watson-Wentworth, daughter of the Earl of Malton. Lord Malton was later created Marquess of Rockingham. Lady Anne"s brother was the future Prime Minister Charles Watson-Wentworth.
Lady Charlotte Fitzwilliam (14 July 1746 – 11 February 1833), who married Thomas Dundas, 1st Baron Dundas and had issue.
And
William Fitzwilliam, Viscount Milton (30 May 1748 – 8 February 1833). His widow Lady Fitzwilliam died on 29 August 1769.
He was elected Member of Parliament for Peterborough on 4 May 1741, and sat until he was created Baron Fitzwilliam in the Peerage of Great Britain on 19 April 1742. He was made a Member of the Irish Privy Council on 6 June 1746, and further created Earl Fitzwilliam in the Peerage of Great Britain on 6 September 1746.