Saint Anselm of Canterbury

From Aosta to a Norman monastery

Anselm was born around 1033 in Aosta, a town in the Alpine foothills of what is now northern Italy, then part of the Kingdom of Burgundy. After a restless youth and years of travel through France, he entered the Benedictine abbey of Bec in Normandy in 1060, drawn there by the reputation of its prior, the theologian Lanfranc. Anselm rose quickly within the community, becoming prior himself after Lanfranc left, and later abbot. It was during these years at Bec that he wrote his earliest and most philosophically ambitious works, developing a habit of working through theological questions using close, patient reasoning rather than leaning primarily on citation and authority — a method that would come to define the emerging scholastic style of the coming centuries.

An argument built from a single definition

Anselm's most famous piece of writing, the Proslogion, attempts something unusual: proving God's existence from reason alone, without appealing to Scripture or the created world as evidence. He proposes defining God as "that than which nothing greater can be conceived," and argues that such a being must exist in objective reality, not merely as an idea in someone's mind, since a being that actually exists is greater than one that exists only as a concept. This line of reasoning, now known as the ontological argument, has been picked apart, defended, and revived by philosophers continuously since Anselm's own century — a contemporary monk named Gaunilo raised an early objection to it, and Anselm wrote a direct reply. Few medieval arguments have had anywhere near this long an afterlife in philosophy departments that have nothing else to do with the medieval Church.

Archbishop against two kings

In 1093, Anselm was made Archbishop of Canterbury, inheriting the highest church office in England at a politically dangerous moment. He clashed repeatedly with King William II, and later King Henry I, chiefly over lay investiture — the practice of kings personally appointing and installing bishops, which Anselm insisted belonged to the Church, not the crown. The conflict drove him into exile from England twice, for a combined total of years spent working from the continent rather than his own cathedral, before a compromise on investiture was finally reached with Henry I in 1107. It was a genuinely dangerous position to hold — arguing that a king's authority over the Church had real limits — and Anselm held it anyway, at real cost to his own career and comfort.

Doctor of the Church, six centuries on

Anselm died in Canterbury in 1109. Pope Clement XI declared him a Doctor of the Church in 1720, more than 600 years later, honoring him as one of the founders of scholastic method — the disciplined, reasoned approach to theology that later thinkers like Saint Albert the Great and his student Thomas Aquinas would build into the great theological systems of the high Middle Ages. His feast is kept on April 21, and he's remembered today as much for a single stubborn phrase, "faith seeking understanding," as for any one completed argument — a description of a whole way of doing theology that continues to shape how the Church thinks about the relationship between belief and reason.