Featured Article Summary #118

The Crusading movement was a major religious, political, and military project of the Middle Ages, usually dated from the Council of Clermont in 1095 when Pope Urban II called for an armed expedition to help Christians in the East under Muslim rule. He presented crusading as a kind of penitential pilgrimage, linking it to growing papal power and the idea of “holy war,” shaped by older arguments about just violence and by Christian teaching. Enthusiasm spread widely, helped by economic growth, weakening Mediterranean powers, and divisions among Muslim rulers, leading crusaders to take territory and form four Crusader states in the Levant. The papacy also backed crusades against other groups, including Muslims in Iberia and pagans in the Baltic, and against opponents of papal authority. While aimed at knights, the movement relied on support from many people, including clergy and commoners, and women sometimes participated as representatives or victims. Over time it developed lasting institutions such as military orders and new frontier states, influenced European culture, and continued in later forms through anti-Ottoman alliances even after early decline. The Crusades are usually described as Christian religious wars in the Middle Ages, fought by Western European soldiers to capture Jerusalem. However, different crusading campaigns varied in how far they spread, how long they lasted, and what motivated them. Overall, the crusading movement created new institutions and ideas that influenced Catholic Europe and nearby regions. Greek and Roman thinkers developed early ideas about when war could be considered just, including the need for a just purpose, a legitimate authority to declare war, and limits such as focusing on defence, restitution, and punishment. As Christianity became central to the Roman Empire, theologians like Ambrose and later Augustine shaped these ideas into Christian just war theory, arguing that wars fought with divine approval could be consistent with biblical teaching if they were officially declared, had a just cause, and were pursued with restraint after peaceful options failed. These ideas were largely forgotten after the Western Roman Empire fell in 476. After the fall of the Western Roman Empire, new Christian kingdoms rose in the West, mostly ruled by Germanic warlords who valued fighting skill and loyalty. The Church still taught that killing was sinful and required penance, even while clergy sometimes supported violence to gain influence. In the East, Byzantium survived but lost much territory, including Jerusalem, to the expanding Islamic Caliphate, and Muslims later conquered large parts of Iberia; after these gains, a three-part world formed: divided Western Europe, a weaker Byzantium, and a growing Islamic realm. Resistance to Muslim advances helped form the small Kingdom of Asturias in north-western Iberia, and it gradually turned into an expansionist movement seen by locals as divinely approved. In the 9th century, invasions across Western Europe revived the idea of holy war, including promises of salvation from Church leaders such as Pope Leo IV. As fighting became constant, mounted warrior groups grew, and the Church’s Peace of God effort to limit violence ended up increasing the Church’s own military role. Concern about corrupt local control and “invalid” religious rites also led to confession and penance, which were later sometimes replaced with indulgences like almsgiving or pilgrimages to the Holy Land, especially Jerusalem.