386–451). Nestorius, a student of the Antiochene school of theology, taught that in the incarnation two distinct hypostases ("substances" or, as Nestorius' critics such as John Cassian and Cyril of Alexandria employed the term, "persons") were conjoined in Jesus Christ—one human (the man) and one divine (the Word).[4] Thus, Mary should not be considered the God-bearer (theotokos), since she only contributed and bore the human nature of Christ (making her the Christotokos). Nestorius and his teachings were condemned by the Third Ecumenical Council, held in Ephesus in 431, which defined the Church of the East.[5] While the Council of Ephesus did not answer the question of how the human and divine interrelated in the person of Christ, it did seem to reject any attempted answer that stressed the duality of Christ's natures to the expense of his unity as a single hypostasis (understood to mean "person").