EUTYCHES (c. 456), a presbyter and archimandrite at Constantinople, first came into notice at the council of Ephesus where, as a zealous adherent of Cyril (q.v.) of Alexan dria, he vehemently opposed the doctrine of the Nestorians (q.v.), and affirmed that after the union of the two natures, the human and the divine, Christ had only one nature, that of the incarnate Word, and that therefore His human body was essentially differ ent from other human bodies. In this he went beyond Cyril and the Alexandrine school generally, who took care to guard against circumscribing the true humanity of Christ. It would seem, how ever, that Eutyches cliff-red from the Alexandrine school chiefly in word, for equally with them he denied that Christ's human nature was transmuted into his divine nature. His imprudent asser tions led to his being accused of heresy by Domnus of Antioch and Eusebius, bishop of Dorylaeum, at a synod at Constantinople in 448 which excommunicated him ; at a council held in Ephesus (449) he was reinstated in his office, and Eusebius, Domnus and Flavian, his chief opponents, were deposed, the Alexandrine doc trine of the "one nature" receiving the sanction of the church. In Oct. 451, a council (the fourth oecumenical) which met at Chalcedon (q.v.) declared the Ephesus synod to have been a "robber synod," its proceedings were annulled, and, in accordance with the rule of Leo, Bishop of Rome, it was declared that the two natures were united in Christ without any alteration or ab sorption. Eutyches died in exile, but of his later life nothing is known. In the 6th century a monk, Jacob, who united the sep arated divisions of the Eutychians, or Monophysites (q.v.), into one church, now known as the Jacobite Church of Armenia, Egypt and Ethiopia, propagated his doctrines of Eutyches.