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 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