Pope from 440. His Papacy is remarkable for the extent to which he advanced and consolidated the influence of the Roman see. He tried to strengthen the Church by energetic central government and he pressed his claims to jurisdiction in Africa, Spain, and Gaul. He was drawn into E. affairs by the Eutychian controversy, and his support was coveted by all parties. At the Council of Chalcedon (451) his legates spoke first, and his Tome was accepted as a standard of Christological orthodoxy. He persuaded the Huns to withdraw beyond the Danube (452) and secured concessions when the Vandals took Rome (455). 143 genuine letters and some 97 sermons survive. Feast day in the E., 18 Feb.; in the W., 10 Nov. (formerly, 11 Apr.).