In the year 391 Valerian, Bishop of Hippo, ordained Saint Augustine a priest, and in 395, appointed him vicar bishop of the see of Hippo. After the death of Bishop Valerian, St Augustine took his place.
During his 35 years as bishop, St Augustine wrote many works devoted to combating the Donatist, Manichaean and Pelagian heresies.
St Augustine wrote many works (according to his student and biographer Possidias, the number approached 1030). Of his works the best known are: The City of God (De civitate Dei), The Confessions, 17 Books against the Pelagians and Handbook of Christian Knowledge (The Enchiridion). St Augustine was concerned above all else that his writings be intelligent and edifying. “It is better,” he said, “for them to condemn our grammar, than for people not to understand.” St Augustine died on August 28, 430.