The document summarizes the key events and motivations of the Crusades between 1095-1291. It discusses how the Seljuk Turks took control of Jerusalem in the 11th century and prevented Christian pilgrimage, motivating the First Crusade launched by Pope Urban II to retake the city. The First Crusade established the Latin Kingdom of Jerusalem but it gradually decayed and the last Christian city, Acre, fell in 1291, ending the Crusades.