1033 – 1109
Anselm of Canterbury was an Italian-born Benedictine monk who became Archbishop of Canterbury and is often called the father of Scholasticism. He is best known for formulating the ontological argument for God's existence in the Proslogion, which attempts to prove God's existence from the concept of a being than which nothing greater can be conceived.
Formulated the ontological argument for God's existence in the Proslogion
Developed the satisfaction theory of atonement in Cur Deus Homo
Pioneered the method of faith seeking understanding (fides quaerens intellectum)
Served as Archbishop of Canterbury from 1093 to 1109
Canonized as a Doctor of the Church in 1720