Leo I (the Great), 461 - Biography. Pope St. Leo I (the Great) - Article on his pontificate, second in Christian antiquity only to that of Gregory the Great in importance. Leo died in 461. Leo the Great, Bishop of Rome, Doctor - Profile. Includes prayer in traditional and contemporary language. Leo the Great, Pope, Doctor of the Church - From the book "Lives of Saints," published by John J. Crawley. Pope St Leo--Pray to God for us! - Focuses on his relevance for Christian unity. Includes article examining his role in Catholic and Orthodox Churches. General Introduction - For the Council of Chalcedon, from the Nicene and Post-Nicene Fathers of the Christian Church, second series, vol. 14. Dwells on the approval of the Tome of Leo. By Henry R. Percival. Introduction - Introduction to the life and writings of St. Leo the Great, from the Nicene and Post-Nicene Fathers of the Christian Church, second series, vol. 12. By Charles Lett Feltoe. Aeterna Dei Sapientia: On Saint Leo the Great - Encyclical of Pope John XXIII promulgated on 11 November 1961. CatholicSaints.Info: Leo the Great - Illustrated profile.