Bruno di Segni (c. 1045 – 18 July 1123) was an Italian Roman Catholic prelate and professed member from the Order of Saint Benedict who served as the Bishop of Segni and the Abbot of Montecassino. He studied under the Benedictines in Bologna before being appointed a canon of the cathedral chapter of Siena. He he was invited to Rome where he became a bishop and counselled four consecutive popes. He served as an abbot in Montecassino but his chastising Pope Paschal II on the Concordat of Ponte Mammolo in 1111 prompted the pope to relieve him of his duties as abbot and order Bruno to return to his diocese, where he died just over a decade later. Bruno's canonization was celebrated on 5 September 1181 under Pope Lucius III who presided over the celebration in the late bishop's diocese. Life Early career Bruno was born circa 1045 in Solero either to nobles or parents of modest means named Andrea and Guglielmina. He spent his theological education in a Benedictine convent of Santa Perpetua near his town in Asti and in Bologna at the college there where he also studied humanities and the liberal arts. It was around this time that he wrote one of his earliest works, Expositio in psalterium Gallicanum, dedicated to his bishop, Ingo of Asti (1072-1079). He became a canon in Siena in 1073, and recollects his life among the canons; perhaps his ordination to the priesthood belongs to the same time, and around that time was assigned as a pastor there. This happened after he decided to go to Montecassino to be a monk but during the trip fell ill in Siena where he remained subject to the needs of Bishop Rudolfus (1073–1083), who named Bruno as a canon of the cathedral Chapter. Episcopate Bruno became noted for his defending orthodox faith and for his extensive knowledge of Sacred Scripture and great piousness. Canon Bruno was in Rome in 1079, and participated in the Sixth Roman Synod of Pope Gregory VII in February 1079. He was one of those who spoke to the assembly on the theory of transubstantiation and the theology of the Blessed Sacrament, against the teaching of Berengarius of Tours; at the synod Berengarius renounced his heresy and was absolved by Pope Gregory. In Rome he was a guest of Pietro Igneo, the Bishop of Albano. Pope Gregory appointed the Bishop of