The cathedral; or, The Catholic and Apostolic church in England (ILLUSTRATED) The Reverend Isaac Williams (1802-1865) was a prominent member of the Oxford Movement (or "Tractarians"), a student and disciple of John Keble and, like the other members of the movement, associated with Oxford University. A prolific writer, Williams wrote poetry and prose including the well known Tract: "On Reserve in Communicating Religious Knowledge." This article is about the English archaeologist. For the U.S. soldier, see John Henry Parker (general). John Henry Parker CB (1 March 1806 - 31 January 1884) was an English archaeologist and writer on architecture and publisher.