Introductory Lectures on Modern History, London: Longmans, Green & Co, 1842. Thomas Arnold (13 June 1795 - 12 June 1842) was an English educator and historian. Arnold was an early supporter of the Broad Church Anglican movement. He was the headmaster of Rugby School from 1828 to 1841, where he introduced a number of reforms.Arnold was born on the Isle of Wight, the son of William Arnold, a Customs officer, and his wife Martha Delafield. He was educated at Lord Weymouth's Grammar School, Warminster, Winchester, and Corpus Christi College, Oxford. There he excelled at Classics and was made a fellow of Oriel in 1815. He was headmaster of a school in Laleham before moving to Rugby.