Council of Chalcedon

Annulled the council of 449, deposed Dioscorus and condemned Eutyches. It received Leo's Tome and Cyril's letters and issued the Chalcedonian Definition: one and the same Christ, Son, Lord, “acknowledged in two natures, without confusion, without change, without division, without separation,” concurring in one person (prosopon) and hypostasis. It issued 27 disciplinary canons plus canon 28, which granted Constantinople privileges equal to Rome's as “New Rome”; Pope Leo rejected that canon. Some 350–370 bishops attended (tradition says 630).

Convoked by

Emperor Marcian (with Empress Pulcheria)

Canons

30

Catholic Church and Eastern Orthodox Church; many Protestant churches accept its Christological definition. The Oriental Orthodox Churches reject it (they accept only the first three councils).