Pope Urban II Calls for First Crusade at Clermont
In the late 11th century, the Byzantine Empire faced mounting pressure from Seljuk Turkish advances in Anatolia, prompting Emperor Alexius I to seek military aid from Western Christendom. Pope Urban II convened the Council of Clermont in France from November 18 to 28, 1095, primarily to address church reforms and the Truce of God. On the final day, November 27, Urban delivered a powerful sermon to clergy and lay nobles assembled outdoors, urging Christians to cease internal conflicts and march to the Holy Land to reclaim Jerusalem and aid Eastern Christians. Contemporary accounts, including that of Fulcher of Chartres who was present, describe the speech invoking religious duty and promising spiritual rewards. The response was immediate and overwhelming, with cries of "Deus vult" echoing as thousands pledged to take the cross.
Why it matters: The sermon directly ignited the First Crusade, leading to the capture of Jerusalem in 1099 and the establishment of Crusader states that altered Mediterranean power dynamics for centuries. It institutionalized the concept of holy war in Western Christianity, influencing subsequent crusades and European expansionist ideologies while fostering long-term cultural and economic exchanges between East and West.