St. Leo the Great

Birth of St. Leo the Great in Rome - future Pope and Doctor of the Church

St. Leo the Great elected Pope - will confront Attila the Hun and define Christ's two natures at Chalcedon

Council of Chalcedon - defines Christ's two natures in one person, deposes Dioscorus, establishes Chalcedonian Definition

Pope St. Leo the Great meets Attila the Hun - persuades him to turn back from Rome

Death of Pope St. Leo the Great - Doctor of the Church, wrote Tome of Leo defining Christ's two natures

Peter Mongus becomes Patriarch of Alexandria - Monophysite usurper, anathematizes Pope Leo and Chalcedon