The Pope had significant influence over Western Europe during the Middle Ages. Pope Urban II called the Crusades in 1096 to retake Jerusalem from Muslim rule and restore it for Christian pilgrimage. The Crusades aimed to unite Christians under the Pope and give knights a purposeful mission. Crusaders included serfs, children, women, nuns, and knights who wanted to fight. While the Crusades failed to permanently retake the Holy Land, they increased cultural exchange between Europe and the East.