William of Champeaux

Guillaume de Champeaux (c. 1070 – 18 January 1121 in Châlons-en-Champagne), known in English as William of Champeaux and Latinised to Gulielmus de Campellis, was a French philosopher and theologian.

He was born at Champeaux near Melun. After studying under Anselm of Laon and Roscellinus, he taught in the school of the cathedral of Notre-Dame, of which he was made canon in 1103. Among his pupils was Peter Abelard, of which he had a disagreement with because Abelard challenged some of his ideas, and William thought Abelard was too arrogant. Abelard calls him the "supreme master" of dialectic after he replaced his master as the new teacher. In 1108 he resigned his positions as archdeacon of Paris and master of Notre Dame, and retreated to the shrine of St Victor, outside the city walls of Paris, where, under his influence, there formed what would become the abbey of St Victor.