When the First Crusade ended with the conquest of Jerusalem in 1099, jubilant crusaders returned home to Europe bringing with them stories, sacred relics, and other memorabilia, including banners, jewelry, and weapons. In the ensuing decades, the memory of the crusaders' bravery and pious sacrifice was invoked widely among the noble families of western Christendom. Popes preaching future crusades would count on these very same families for financing, leadership, and for the willing warriors who would lay down their lives on the battlefield. Despite the great risks and financial hardships...