A. Urban II
These incursions prompted the emperor of Byzantium, Alexius I Comnenus to send a delegation to Piacenza, Italy, asking Pope Urban II in March 1095 for help against the Turks. On November 27, 1095, in Clermont, France, Pope Urban II called for a crusade to help the Byzantines and to free the city of Jerusalem.
Karl marx believed that the workers of the world (proletariat) would unite and overthrow the upper class (bourgoisie) and form a dictatorship of the proletariat. He believed that over time this dictatorship would dissolve and there would be a classless society of pure socialism, or communism