Pope military aid from Pope Urban II in the ongoing Byzantine–Seljuq wars. Urban, at the council of Clermont, called the First Crusade to assist the Byzantine Empire to regain the old Christian territories, especially Jerusalem. With the East–West Schism, the Eastern Orthodox Church and the Catholic Church split definitively in 1054. This fracture was caused more by political events than by slight divergences of creed. Popes had galled the Byzantine emperors by siding with the king of the Franks, crowning a rival Roman emperor, appropriating the Exarchate of Ravenna, and driving into Greek Italy. In the Middle Ages, popes struggled with
Bertrand de Montredon Bertrand de Montredon Bertrand de Montredon was an 11th-century Catholic bishop. He was consecrated by Pope Urban II, and was bishop of Nîmes from 1095 to 1097 and then of Narbonne from 1097–1106. As Bishop of Nimes he attended the Council of Clermont in 1095, and the synod convened for the blessing of Maguelonne island and the founding of a church there, He was also at the wedding of count Raymond of Saint-Giles. After serving as Archbishop of Narbonne, he was replaced in the dispute between Psalmodi and St. Victor of Marseille by the mediator Raymond William of Montpellier, possibly