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
Roman Catholic Diocese of Saint-Flour of it except the church. Amblard and Astorg, from 1010 to 1013, gave this church and its fief to St. Peter's at Rome, together with the monastery of Sauxillanges, governed by Odilo; but later Amblard considered this donation as void, and constructed a fortress, a remnant of which is now the sacristy of the cathedral, on the site of the old monastery; afterwards Amblard, seized with remorse at Rome, between 1025 and 1031 gave back to Odilo all he possessed, and a large monastery was again founded. Pope Urban II, after the Council of Clermont (1095), consecrated the church of