Assertio septem sacramentorum; or, Defence of the seven sacraments, Henry, King of England [English & Latin], Louis O'Donovan, James Cardinal Gibbons, New York, Benziger brothers, 1908.

Henry VIII considered himself a thoroughly Catholic King, and in 1521 he defended the papacy against Luther in a book he commissioned entitled, The Defence of the Seven Sacraments, for which Pope Leo X awarded him the title Fidei Defensor (Defender of the Faith).