Προτέριος Αλεξανδρείας

Proterius of Alexandria (d. 457), Patriarch of Alexandria (451-457), was elected by the Council of Chalcedon in 451 to replace Dioscorus of Alexandria, who had been deposed by the same council (cf. Evagrius Scholasticus, Ecclesiastical History, book 2, chapter 5[1]). His accession marks the beginning of the Schism of 451 between the Coptic and the Orthodox patriarchs of Alexandria, which would lead to the formation of the Oriental Orthodox. Because the church of Alexandria was largely monophysite the deposition of Dioscorus, a monophysite, from and the elevation of Proterius, a Chalcedonian, to the patriarchate was violently opposed. Finally in 457 the monophysite party in Alexandria elected Timothy II Aelurus as patriarch, deposing Proterius, who was subsequently murdered (Evagrius, 2, 8[2]).