This is not the place to investigate the interesting question of the truth of Gregory's charges against Frederick. The French sent a mission to Frederick to enquire as to the accusation of infidelity, and he thanked them warmly and denied it. The Duke of Bavaria told Gregory in 1241 that most of the German princes and prelates would shortly go to Frederick's aid. In fact, the papal exactions had caused intense disgust over all Western Europe, and no prince would allow himself to be set up as a rival to Frederick. Yet the papal condemnation caused many to hold aloof from the Emperor who, moreover, did not venture to set up an antipope. He contented himself with persecuting the friars who were the most active emissaries of Rome, and with confiscating the estates of the Church, until it was said at the papal Court that he had sworn to reduce the Pope to beggary and to stable his horses in St. Peter's. [Sidenote: Innocent IV (1243-54).] Frederick had suggested the calling of a council, and Gregory summoned one to Rome. But Frederick had begun to reduce the Roman duchy and, anyhow, he did not want a council which would merely register the papal decrees. So when a number of bishops ignored his prohibition and met at Genoa in order to embark for Rome, the fleets of Pisa and Sicily met them off the island of Meloria and captured nearly the whole of the prospective Council. Frederick's attack upon Rome itself was only averted by the death of Gregory IX on August 21, 1241. The new Pope died seventeen days after his election, and then, for some reason, the Papacy was vacant for two years. The delay was attributed to Frederick; and the French actually declared to the Cardinals that if a new Pope were not chosen quickly, the French nation, in accordance with an ancient privilege given by Pope Clement to St. Denys, would set up a Pope of their own. At length, in June, 1243, Innocent IV was chosen; and Frederick, alluding to previous dealings with him, remarked that by this election he had lost a friend among the Cardinals, since no Pope could be a Ghibelline. The truth of this was soon apparent. Innocent demanded the restoration of all Frederick's conquests in the States of the Church in return for peace; and although nothing was said about the time of the removal of the excommunication, Frederick accepted the terms. But when Frederick saw that there was no intention of absolving him, he refused to surrender the papal cities and thereby technically broke the treaty. Innocent intended to get a treaty which would carry an acknowledgment of the Emperor's failure, and then to reduce him to submission by a council held outside Italy. Negotiations continued until Innocent fled to Lyons, a practically independent city. France, England and Aragon, however, declined to receive him, and Innocent exclaimed that he must come to terms with the Emperor, "for when the dragon has been crushed or pacified, the little serpents will be quickly trodden underfoot."