28 February / 13 March
This saint was a priest in Alexandria at the time that the Patriarch there was the heretic Dioscorus, one of the founders of the Monophysite heresy which holds that in Christ there are not two natures but one. At that time, Marcian and Pulcheria were on the imperial throne. Proterius, a holy and devout man, stood up against Dioscorus, as a result of which he endured much misery. Then the 4th Ecumenical Council was summoned at Chalcedon, at which the Monophysite heresy was condemned. Dioscorus was cast down from the patriarchal throne and sent into exile, and in his place the orthodox Proterius was chosen, He governed the Church with zeal and love, a true follower of Christ. But the followers of Dioscorus did not stop creating confusion in Alexandria. In the face of such bloody chaos, Proterius left the town with the intention of going away for a time, but the Prophet Isaiah appeared to him on the road and said: 'Return to the town; I am waiting to take you.' Proterius returned and went into the church. Hearing of this, the insolent heretics rushed into the church, seized the Patriarch and stabbed him. About six of the faithful perished along with Proterius. Thus this wonderful pastor of Christ's flock received the crown of martyrdom for the truth of Orthodoxy, in 457.
On the same day: St Basil the Confessor; The Hieromartyr Nestor, Bishop of Magydos; Blessed Nicolas the Fool for Christ of Pskov; Our Holy Father John Cassian; Our Holy Father Barsanuphius; St. Oswald, archbishop of York (992)