David Hartley the Younger (1732 – 19 December 1813) was a statesman, a scientific inventor and the son of the philosopher David Hartley. He was Member of Parliament (MP) for Kingston upon Hull, and also held the position of His Britannic Majesty's Minister Plenipotentiary, appointed by King George III to treat with the United States of America as to American independence and other issues after the American Revolution. He was a signatory to the 1783 Treaty of Paris, which ended the American Revolutionary War. Hartley was the first MP to put the case for abolition of the slave trade before the House of Commons, moving a resolution in 1776 that "the slave trade is contrary to the laws of God and the rights of men". Life Hartley was born in Bath, Somerset, England in 1732. He matriculated at Corpus Christi College, Oxford on 6 April 1747 at the age of 15. He was awarded his B.A. on 14 March 1750 and was a fellow of Merton College, Oxford until his death. He became a student of Lincoln's Inn in 1759. During the 1760s he gained recognition as a scientist and, through mutual interests, he met and became an intimate friend and correspondent of Benjamin Franklin. Hartley was sympathetic to the Lord Rockingham's Whigs, although he did not hold office in either Rockingham ministry. He represented Kingston upon Hull in parliament from 1774 to 1780, and from 1782 to 1784, and attained considerable reputation as an opponent of the war with America, and of the African slave trade. He was expert in public finance and spoke frequently in Parliament in opposition to the war in America. Although a liberal on American policy, Hartley was a long-time friend of Lord North and strongly disliked the Prime Minister, Shelburne. He supported the Coalition by voting against Shelburne's peace preliminaries. It was probably owing to his friendship with Benjamin Franklin, and to his consistent support of Lord Rockingham, that he was selected by the government to act as plenipotentiary in Paris, where, on 3 September 1783, he and Franklin drew up and signed the definitive treaty of peace between Great Britain and the United States. Hartley died at Bath on 19 December 1813 in his eighty-second year. His portrait was painted by George Romney and has been engraved by J. Walker in mezzotint. Nathaniel William Wraxall says that Hartley, "though destitute of all personal