Pope Leo the Great is the first Pope whose sermons and letters, many of which were on faith and charity, were preserved in extensive collections. He served as pontiff from 440 until his death in 461. His writing on the Incarnation was acclaimed at the Council of Chalcedon in 451.

Prior to his pontificate, Leo was a deacon and active as a peacemaker in the Roman Empire. He is most remembered for having successfully persuaded Attila the Hun not to plunder Rome. He was not as successful during another attack three years later, however. Nevertheless, he managed to save the city from being burnt. He stayed on to help the people rebuild Rome.

He was made a Doctor of the Church in 1754.

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