Christians had been making pilgrimages to the Holy Land for centuries, but when local Muslim rulers began to persecute Christian pilgrims in the 11th-century, Pope Urban II called for a crusade to recapture Jerusalem and to rid Europe of feuding Christian princes. Told using primary source material and illuminated manuscripts, this is the story of the successful but savage First Crusade that established the Christian kingdom of Jerusalem in the Middle East in 1099.