Anselm

St. Anselm of Canterbury (born 1033/34, Aosta, Lombardy [Italy]—died April 21, 1109, possibly at Canterbury, Kent, England; feast day April 21) was an Italian-born theologian and philosopher, known as the father of Scholasticism, a philosophical school of thought that dominated the Middle Ages. He was recognized in modern times as the originator of the ontological argument for the existence of God (based on the idea of an absolutely perfect being, the fact of the idea being in itself a demonstration of existence) and the satisfaction theory of atonement or redemption (based on the feudal theory of making satisfaction or recompense according to the status of a person against whom an offense has been committed, the infinite God being the offended party and humanity the offender). There is incomplete evidence that he was canonized in 1163, though some scholars contend that he was canonized by Pope Alexander VI in 1494. 

Kemp, John Arthur. "St. Anselm of Canterbury". Encyclopedia Britannica, 17 Apr. 2025, https://www.britannica.com/biography/Saint-Anselm-of-Canterbury. Accessed 11 May 2025.