Guilliaume de Montfort He fought in the First Crusade, but was killed there in battle on 27 August 1101. Guilliaume de Montfort Guilliaume de Montfort () (died 27 August 1101) was a French bishop, most notably the Bishop of Paris from 1095 to 1101. Montfort's date of birth is not known, but it was some time before the death of his father, Simon I de Montfort in 1087. He was Bishop of Yves some time before becoming the Bishop of Paris. In 1095, Pope Urban II held the Council of Clermont at Clermont-Ferrand, France. It excommunicated Philip I of France and Bertrade de
Simon II of Clermont-Nesle king engaged the best available lawyers for his case. The conflict led in 1309 to the moving of the Papal court, under Pope Clement V (c. 1264–1314), to Avignon, outside the king's realm. Simon was a son of Simon II of Clermont, Seigneur of Ailly, Maulette and Nesle (c. 1216–1286) by Adele of Montfort (d. 1279), daughter of Amaury VI of Montfort. The father was a counsellor of King "Saint" Louis IX of France and was appointed regent ("lieutenant") while the king went away on the Seventh Crusade. Simon had three brothers and at least one sister, whose son was