Definition
The Crusades were a series of military campaigns, launched mainly between 1095 and 1291, in which Western European Christians attempted to capture and defend Jerusalem and the surrounding Holy Land from Muslim rule. Pope Urban II called the First Crusade, framing it as both a holy duty and a path to spiritual reward.
Although the wars were waged in the name of religion, they were also driven by ambition, land hunger, and the search for trade and adventure. Over nearly two centuries, several major Crusades — and many smaller ones — were fought, with shifting and ultimately inconclusive results.
Why it matters
How it works
A Crusade typically began with a papal appeal that promised participants the remission of sins. Knights, nobles, and ordinary people took vows, raised funds, and traveled — often disastrously — toward the Holy Land. Success depended on supply lines, alliances, and the unity of fractious leaders, which frequently broke down.
Even when military aims failed, the side effects endured. Italian port cities such as Venice and Genoa grew wealthy provisioning the campaigns and trading the eastern goods that crusading appetites had popularized back home.