Augustine of Hippo

Augustine of Hippo (Nov 13, 354 - Aug 28, 430) is a church father who was one of the four great Latin fathers, so one of the eight doctors of the church. He is best known for writing his Confessions and City of God. He also helped to start the idea of Just War Theory and documented the doctrine of original sin, total depravity, and predestination for the first time.  He was influenced by Ambrose, mother Monica.

Original Sin

Sola Gratia

The Lord's Supper