The Venerable John Henry Cardinal Newman (1801-1890) was a Roman Catholic priest and Cardinal who converted to Roman Catholicism from Anglicanism in 1845. In early life he was a major figure in the Oxford Movement to bring the Church of England back to its Catholic roots. Eventually his studies in history persuaded him to become a Roman Catholic. Both before and after his conversion he wrote a number of influential books, including Via Media, Essay on the Development of Christian Doctrine, Apologia Pro Vita Sua and The Grammar of Assent. Apologia Pro Vita Sua is the classic defence of the religious opinions of John Henry Newman, published in 1864 in response to what he saw as an unwarranted attack on Roman Catholic doctrine by Charles Kingsley. A revised version, with many passages rewritten and some parts omitted was published in 1865.