Fitzwilliam, William Wentworth, 4th Earl Fitzwilliam (1748 -1833)
William Wentworth Fitzwilliam, 4th Earl Fitzwilliam, was the eldest son of William, 3rd Earl, and Anne Watson Wentworth, eldest daughter of Thomas, Marquess of Rockingham, and sister and coheir of Charles, 2nd Marquess. He succeeded to the title in 1756. He was educated at Eton and King's College, Cambridge, and was created a D.C.L. of Oxford University 3 July 1793. He married, 11 July 1770, Charlotte Ponsonby, second daughter of William, 2nd Earl of Bessborough, and they had an only son. He was Lord President of the Council from July to December 1794, Lord Lieutenant of Ireland for a very short time in 1795, Lord President of the Council again during the short lived Whig ministry of 1806. His first countess died in 1822, and he married, secondly, 21 July 1823, Louisa Molesworth, fourth daughter of the Richard, 3rd Viscount Molesworth, and widow of William Ponsonby, 1st Baron Ponsonby. She died 1 September 1824.