Saint Gennadios,in Greek Άγιος Γεννάδιος,was the twenty-first Ecumenical Patriarch of Constantinople (458 - 471). Gennadios is seen to have been a learnt writer and followed the Antiochene school of literal exegesis although little writings has been left about him. He is celebrated in the Greek Orthodox Church on November 17, but is not listed in the Roman Martyrology.