In 1266, Charles of Anjou, who was heading south to fight the Hohenstaufen on behalf of the pope, was appointed Senator. Charles founded the Sapienza, the university of Rome. In that period the pope died, and the cardinals, summoned in Viterbo, could not agree on his successor. This angered the people of the city, who then unroofed the building where they met and imprisoned them until they had nominated the new pope; this marked the birth of the conclave. In this period the city was also shattered by continuous fights between the aristocratic families: Annibaldi, Caetani, Colonna, Orsini, Conti, nested in their fortresses built above ancient Roman edifices, fought each other to control the papacy.