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
Raoul II of Clermont of Clermont". Raoul II of Clermont Raoul II/III of Clermont-Nesle (c. 1245 – Kortrijk, July 11, 1302) was Seigneur (Lord) of Nesle in Picardy , Viscount of Châteaudun , Grand Chamberlain of France and Constable of France. Raoul was the eldest son of Simon II of Clermont (c. 1216 – 1286) by Adele ("Alix") of Montfort (d. 1279), daughter of Amaury VI of Montfort. His father had a brother called Raoul (d. a. 1243), sometimes numbered II, causing confusion about the parentage of Raoul's children, as either somehow might come into question. Having Raoul's uncle as No. II and his