Saint Augustine , Bishop of Hippo, in Algeria, was a philosopher and theologian. Augustine, a Latin Father and Doctor of the Church, is one of the most important figures in the development of Western Christianity. Augustine was radically influenced by Platonic doctrines. He framed the concepts of original sin and just war. When Rome fell and the faith of many Christians was shaken, Augustine developed the concept of the Church as a spiritual City of God, distinct from the material City of Man. His thought profoundly influenced the medieval world view.
Augustine was born in present day Algeria to a Christian mother, Saint Monica. He was educated in North Africa and resisted his mother's pleas to become Christian. He lived as a pagan intellectual, took a concubine, and became a Manichean. He later converted to Christianity, became a bishop, and opposed heresies, such as the belief that people can have the ability to choose to be good to such a degree as to merit salvation without divine aid. His works are still read around the world.