Miaphysite Christianity encompasses the Coptic Church and the Armenian Apostolic Church. Miaphysites stress that Christ had but a single nature, but of both human and divine character. This stance split them off from the main branch of Christianity after the Council of Chalcedon in 451. Though not viewed as outright heretics by Orthodox and Catholic Christians, it is a fine distinction. The nominal head of the Miaphysite Church is the Pope of Alexandria.