John Hamilton (1715–1796)
John Hamilton (4 February 1715 – 12 February 1796) was a Scottish MP in the British Parliament. He was the second son of Sir Robert Dalrymple of Castleton, Haddington and changed his name to Hamilton in 1736 when he inherited the estate of Bargany in south Ayshire, by a decision of the House of Peers, on the death of James Hamilton, 4th Lord Bargany. He represented Wigtown Burghs 1754-1761 and 1762-1768. He was also MP for Wigtownshire 1761-February 1762. Hamilton was a friend of Frederick, Prince of Wales and supported the Grenvilles in politics. He  was an energetic man, who enthusiastically promoted negotiated arrangements in 1754 and 1762 which led to the rival Stewart family supporting him as MP for Wigtown Burghs in exchange for Dalrymple support in the Wigtownshire constituency. He died childless in 1796 and the Bargany estate passed to his nephew, Sir Hew Dalrymple, 3rd Baronet of North Berwick, who thereupon also assumed the additional surname of Hamilton.