The document discusses the Crusades that took place between the 11th and 13th centuries in response to the Muslim conquest of Jerusalem in 1076. It describes how Pope Urban II launched the First Crusade in 1095 to retake the Holy Land. The Crusaders succeeded in capturing Jerusalem in 1099 and established the Kingdom of Jerusalem. However, Saladin and the Muslims were able to retake the city in 1187, prompting the Third Crusade led by King Richard I of England, King Philip II of France, and others to try to recapture Jerusalem but ultimately fail. The Crusades had lasting effects on Europe and relations with the Muslim world.