Leo, St

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Leo, St (d. 461), pope from 440 and Doctor of the Church; known as Leo the Great. He defined the doctrine of the Incarnation at the Council of Chalcedon (451) and extended the power of the Roman see to Africa, Spain, and Gaul. He persuaded the Huns to retire beyond the Danube and secured concessions from the Vandals when they captured Rome. His feast day is (in the Eastern Church) 18 February; (in the Western Church) 11 April.