Bruno (bishop of Segni) that won him much praise and admiration. In April 1082 he was travelling from Segni to Rome when Adolfo di Segni seized and imprisoned him. He was freed and returned to Rome but was imprisoned once more alongside the pope in the Sant'Angelo castle. Pope Victor III named him as the Vatican Librarian and he held the position until he left for Montecassino in 1099. Bruno had connections to Pope Urban II whom he accompanied to the Council of Clermont in late 1095 where the First Crusade was inaugurated. He travelled with the pope to Avignon from 11-13 September before
Pope Urban V Avignon. He was appointed by the Bishop of Clermont, Pierre de Aigrefeuille (1349-1357) to be his Vicar General, which meant in effect that he ruled the diocese on behalf of the bishop. When Bishop Pierre was transferred to Uzès (1357-1366), Guillaume Grimond became Vicar General of Uzès. Guillaume was named abbot of the monastery of Saint-Germain en Auxerre on 13 February 1352 by Pope Clement VI. In 1359 the town and abbey were captured by the English and subjected to heavy imposts. In the summer of 1352 Pope Clement VI summoned Abbot Guillaume for an assignment. Northern Italy had been