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
First Crusade between Rome and Constantinople in the years immediately before the crusade. In July 1095, Urban turned to his homeland of France to recruit men for the expedition. His travels there culminated in the ten day Council of Clermont, where on Tuesday 27 November he gave an impassioned sermon to a large audience of French nobles and clergy. There are five versions of the speech recorded by people who may have been at the council (Baldric of Dol, Guibert of Nogent, Robert the Monk, and Fulcher of Chartres) or who went on crusade (Fulcher and the anonymous author of the Gesta