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
Pope Urban II declarations against simony, lay investitures, clerical marriages (partly via the "cullagium" tax), and the emperor and his antipope. He facilitated the marriage of Matilda, countess of Tuscany, with Welf II, duke of Bavaria. He supported the rebellion of Prince Conrad against his father and bestowed the office of groom on Conrad at Cremona in 1095. While there, he helped arrange the marriage between Conrad and Maximilla, the daughter of Count Roger of Sicily, which occurred later that year at Pisa; her large dowry helped finance Conrad's continued campaigns. The Empress Adelaide was encouraged in her charges of sexual coercion against