Augustine (354-430) was a philosopher and theologian and the most famous and influential of the church fathers for the Latin (Western) church. After his conversion, memorably described in his Confessions, Augustine became a priest and soon a bishop in Hippo in northern Africa.
His most famous writings include On the Trinity and City of God, in which he described human history as an ongoing struggle between two kingdoms – the city of God and the city of man.
Augustine is the preeminent member of the great tradition of Christian Platonism, and his thought had an enormous impact both on the Scholastics of the medieval period and on the Protestant Reformers.1
1. C.Stephen Evans, Pocket Dictionary of Apologetics & Philosophy of Religion (Downers Grove, IL: InterVarsity Press, 2002), p. 14.