(PUBOxford University)Known as the author of the 'ontological' argument for the existence of God and for his 'substitutionary' theory of the atonement, Anselm was one of the most powerful medieval thinkers. Included are Monologion, Proslogion, Why God Became Man, On the Virgin Conception, and Original Sin, plus 13 others. 480 pages, softcover.