his successor Pope Eugenius III: by this stage, the commune, allied with the aristocracy, was supported by Arnaldo da Brescia, a monk who was a religious and social reformer. After the pope's death, Arnaldo was taken prisoner by Adrianus IV, which marked the end of the commune's autonomy. Under Pope Innocent III, whose reign marked the apogee of the papacy, the commune liquidated the senate, and replaced it with a Senatore, who was subject to the pope. In this period, the papacy played a role of secular importance in Western Europe, often acting as arbitrators between Christian monarchs and exercising additional political powers. 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. Pope Boniface VIII, born Caetani, was the last pope to fight for the church's universal domain; he proclaimed a crusade against the Colonna family and, in 1300, called for the first Jubilee of Christianity, which brought millions of pilgrims to Rome. However, his hopes were crushed by the French king Philip the Fair, who took him prisoner and killed him in Anagni. Afterwards, a new pope faithful to the French was elected, and the papacy was briefly relocated to Avignon (1309–1377). During this period Rome was neglected, until a plebeian man, Cola di Rienzo, came to power. An idealist and a lover of ancient Rome, Cola dreamed about a rebirth of the Roman Empire: after assuming power with the title of Tribuno, his reforms were rejected by the populace. Forced to flee, Cola returned as part of the entourage of Cardinal Albornoz, who was charged with restoring the Church's power in Italy. Back in power for a short time, Cola was soon lynched by the populace, and Albornoz took possession of the city. In 1377, Rome became the seat of the papacy