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Saint Gennadius I of Constantinople (died 471, Constantinople; feast day August 25) was a Byzantine theologian, biblical exegete, and patriarch. He was a champion of Christian Orthodoxy who strove for an ecumenical (Greek: “universal”) statement of doctrine on the person and work of Christ to reconcile the opposing Alexandrian (Egyptian) and Antiochene (Syrian) theological traditions. Abbot of a monastery in Constantinople, Gennadius became patriarch in 458 and, with the counsel of Pope Leo I (440–461),...