Anselm of Canterbury (1033-1109)

Anselm on God's Existence from Paul Halsall at Fordham Univ.; includes the David Burr translation of the Proslogion and Gaunilo's Reply
Cur Deus Homo (Why God Became Man) also from Halsall's Medieval Sourcebook. Here one also finds the Monologion and Criticisms of Anselm's ontological argument

Anselm of Canterbury from the Internet Encyclopedia of Philosophy

Anselm of Canterbury, from Garth Kemerling's philosophy site

// but when searching the philosophy sites, don't forget Anselm was using an Augustinian "graced reason"!

Bibliography on Anselm and the 12th Century Renaissance from Rev. William Harmless, S.J.