Then, fortified with papal money and supplies, Charles marched into Naples. Having defeated and slain Manfred in the great Battle of Benevento, Charles established himself firmly in the kingdom of Sicily at the conclusive Battle of Tagliacozzo, in which Conradin, the last of the house of Hohenstaufen, was taken prisoner. Clement IV is said to have disapproved of the cruelties committed by his protégé, but the statement by Gregorovius that Clement IV became an accomplice by refusing to intercede for the unfortunate Conradin whom Charles had beheaded in the marketplace of Naples seems contentious. However, Gregorovius may be basing this conclusion on the position of Urban IV's predecessors, Innocent IV and Alexander IV, who were Conradin's official guardians.