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
Simon II of Clermont-Nesle the famous Robert VIII Bertrand , a Marshal of France. His brothers were famous French generals, Raoul of Clermont, Viscount of Châteaudun and Seigneur of Nesle, Constable and Grand Chamberlain of France, and Guy I of Clermont, Marshal of France, Seigneur of Offemont and Ailly, both killed 1302 in the Battle of the Golden Spurs. Simon II of Clermont-Nesle Simon II of Clermont-Nesle (born after 1250 – died 22 December 1312 or c. February 1313), Peer of France and bishop of Noyon (1297–1301) and Bishop-count of Beauvais (1301–c. 1312). Simon was one of few bishops that supported King Philip IV