Pope Leo I (c. 400 – 10 November 461), also known as Saint Leo the Great, reigned from 29 September 440 to his death in 461.
He was an Italian aristocrat, and was the first pope to have been called "the Great". He is perhaps best known for having met Attila the Hun in 452 and persuading him to turn back from his invasion of Italy. He is also a Doctor of the Church. His Papacy began September 20, 440 and ended November 10, 461. His feast day is November 10th.