Catechism of the Council of Trent
The Roman Catechism, composed by order of the Council of Trent (1566) and promulgated by Pope St. Pius V as a doctrinal manual for parish priests. Structured in four parts: the Apostles' Creed, the Sacraments, the Decalogue, and the Lord's Prayer. Translation by John A. McHugh, O.P. and Charles J. Callan, O.P. (1923).