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
Roman Catholic Archdiocese of Clermont Aquitaine by Pope John XXII, resulting in the creation of the diocese of Saint-Flour. In 1822, in the reorganization of French dioceses by Pope Pius VII, following the restoration of the Bourbon monarchy, the diocese of Clermont lost the Bourbonnais, on account of the erection of the diocese of Moulins. Since the reorganization in 2002 by Pope John Paul II, there are now four dioceses in the Province of Clermont: Clermont, Le Puy-en-Velay, Moulins, and Saint-Flour. The first Bishop of Clermont was Saint Austremonius (Stramonius). According to local tradition he was one of the seventy-two Disciples of Christ, by birth