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
Renaud II, Count of Clermont-en-Beauvaisis Vermandois, and his wife Adele of Valois. Renaud and Adelaide had at least one child: Renaud married a second time to a woman whose name is not known; they had four children: Widowed, Renaud married for the third time, in 1129, to Clemence de Bar, daughter of Reginald I, Count of Bar, and his wife Giselle de Vaudémont. Renaud and Clemence had six children: Upon his death, Renaud was succeeded as Count of Clermont-en-Beauvaisis by his son Raoul. Renaud II, Count of Clermont-en-Beauvaisis Renaud II of Clermont ("Renaud/Rainald II de Clermont"; 1075–1152), son of Hugh I, Count of Clermont-en-Beauvaisis, and