Pope St. Leo (c. 400–461) was the foremost defender of orthodox Christianity against the heresies of Eutyches and Dioscorus, who taught that there was only one nature in the Lord Jesus Christ. He is the first pope to have been called "the Great".
Pope St. Leo (c. 400–461) was the foremost defender of orthodox Christianity against the heresies of Eutyches and Dioscorus, who taught that there was only one nature in the Lord Jesus Christ. He is the first pope to have been called "the Great".