EUTYCHES, a Constantinopolitan abbot, who, contending with Neitorius, fell into a new heresy, affirming Christ to be one thing, and the Word another. His followers were called Eutychians. Being condemned in the synod of Constantinople, convened by Flavianus the bishop, he appealed to the emperor. After which, by the assistance of Dioscurus bishop of Alexandria, and Chrysaphius, he obtained a synod at Ephesus, called Lastrica, or the Assembly of Thieves and Robbers, wherein he got his heresy to be approved. However, in the second oecumenical council of Chalecedon, under Martin, his errors were a second time condemned.