Fitzmaurice, John Petty, 1st Earl of Shelburne (1706 -1761)
John Fitzmaurice was the second son of Thomas, 1st Earl of Kerry and Viscount Clanmaurice, and Anne, only daughter of Sir William Petty, Knight. He succeeded to the estates of his uncle Henry, Earl of Shelburne 17 April 1751, and took the name and arms of Petty. He was created Viscount Fitzmaurice and Baron Dunkeron in the peerage of Ireland 7 October 1751, and Earl of Shelburne 26 June 1753. He was further created Lord Wycombe in the peerage of Great Britain 17 May 1760. He married, 13 February 1734, his first cousin, Mary daughter of William Fitzmaurice. His eldest son was created Marquess of Lansdowne 6 December 1784.