Aurelius Augustinus(354-430) aka Saint Augustine of Hippo. Augustine was born in Thagaste, in what is now Algeria. In 395, he became the bishop of Hippo.
His most famous works were The Confessions -- one of the most celebrated accounts of Christian conversion in history, and De Civitate Dei The City of God. A Neo Platonist, he is one of the great medieval philosophers, and his influence is seen in the works of modern philosophers, such as Descartes and Malebranche.
St. Augustine died in August 430, while the vandals were besieging Hippo. Augustine is given the title of Doctor of the Catholic Church
for more information see: http://plato.stanford.edu/entries/augustine/