Pope Dioscorus I of Alexandria

Dioscorus I (Greek: Διόσκορος Α΄ ὁ Ἀλεξανδρείας), also known as Dioscorus the Great, was the pope of Alexandria and patriarch of the See of St. Mark who was deposed by the Council of Chalcedon in 451. He was recognized as patriarch by the Coptic Church until his death. He died in Gangra, Paphlagonia, in September 454. He is venerated as a saint by the Coptic and other Oriental Orthodox Churches.

Source: Wikipedia — https://en.wikipedia.org/wiki/Pope_Dioscorus_I_of_Alexandria