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
Papal travel pope to visit Constantinople until Pope Paul VI did again in 1967. Pope Stephen II (752-757) became the first pope to cross the Alps in 752 to crown Pepin the Short. This made him the first pope to visit the Frankish empire. Pope John VIII (872-882) visited France in 878, and Pope Leo IX (1049–1054) travelled to France on September 29, 1049. The next pope to enter France was Pope Urban II (1088–1099), who stopped at Valence and Le Puy on his way to the Council of Clermont (1095). Pope Pius VII (1800–1823) was in Paris in 1804 for the