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St. Augustine of Hippo
Though his most famous work is The Confessions, Augustine, who has one of the most interesting conversion stories in history, also wrote The City of God and a number of works correcting the heresies of the time. Born in 354 in Thagaste, Numidia (modern-day Souk Ahras, Algeria), he eventually became the bishop of Hippo Regius, modern-day Annaba, Algeria. He died in  430 and is a Doctor of the Church.

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