Saint Eulogius of Alexandria was Greek Patriarch of that see (Eulogius I) from 580 to 608. He is regarded as a saint, with a feast day of September 13. He was a successful combatant of the heretical errors then current in Egypt, notably the various phases of Monophysitism. He was a warm friend of Pope St. Gregory the Great, who corresponded with him, and received from that pope many flattering expressions of esteem and admiration. Among other merits the pope makes special mention of his defence of the primacy of the Roman See.