At eighteen he matriculated at
St John's College, Oxford, where he became a
chaplain. Being removed by the vice-chancellor,
Tobias Matthew, in 1579 on suspicion of Catholic tendencies, he went to
Reims in August, was ordained at
Châlons on 24 February 1580, and returned to England in June of that year. Hartley helped
Robert Parsons and
Edmund Campion in printing and distributing their books in England. On 4 August 1581 (Pollen gives 13 August) a search of
Stonor Park in
Oxfordshire found the press on which Campion's
Decem Rationes had been printed. Hartley, along with members of the Stonor family, printers and some servants, were arrested at Stonor Park. Hartley was sent to
Marshalsea Prison, London. Here he was detected saying Mass in a cell before
Lord Vaux, and for this he was laid in irons on 5 December 1583. He was indicted for conspiracy, despite the fact that he had already been imprisoned in the Marshalsea at the time the alleged conspiracy took place. In January 1585, he was sent into exile and put on board a ship at Tower Wharf bound for Normandy. He then spent some little time at Reims, recovering his health, and made a pilgrimage to Rome on 15 April 1586, before returning to the English mission. In the aftermath of the Armada, Hartley was executed at
Shoreditch on 5 October 1588. ==Companions==