St. Augustine of Hippo
Name at birth: Aurelius Augustinus
Augustine was born in a Roman province in 354 and educated at Carthage. As a young man he became interested in philosophy, with little interest in Christianity until a religious experience in his early thirties. By 396 he had become bishop of Hippo, and his sermons and writings gained fame, notably his Confessions and the treatise City of God. His notions of God's grace, free will and Original Sin had a great influence on Christian theology. He died in 430.
Some sources give his birthdate as 13 November 354 and his death date as 28 August 430.