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
Philip I of France with Bertrade de Montfort, the wife of Fulk IV, Count of Anjou. He repudiated Bertha (claiming she was too fat) and married Bertrade on 15 May 1092. In 1094, he was excommunicated by Hugh of Die, for the first time; after a long silence, Pope Urban II repeated the excommunication at the Council of Clermont in November 1095. Several times the ban was lifted as Philip promised to part with Bertrade, but he always returned to her, but in 1104 Philip made a public penance and must have kept his involvement with Bertrade discreet. In France, the king was opposed