The successor of Gregory was Pope Celestine IX. But this pontiff died soon after his election; and after a delay of eighteen months, during which Frederick marched against Rome on two occasions and devastated the lands of his opponents, one of his partisans, Sinibaldo Fiesco, was chosen pope, and took the name of Innocent IV. Negotiations for peace were begun, but the relations of the Lombard cities to the Empire could not be adjusted, and when the emperor began again to ravage the papal territories Innocent fled to Lyons. Hither he summoned a general council, which met in June 1245; but although Frederick sent his justiciar, Thaddeus of Suessa, to represent him, and expressed his willingness to treat, sentence of excommunication and deposition was pronounced against him. Once more an interchange of recriminations began, charged with all the violent hyperbole characteristic of the controversial style of the age. Accused of violating treaties, breaking oaths, persecuting the church and abetting heresy, Frederick replied by an open letter rebutting these charges, and in equally unmeasured terms denounced the arrogance and want of faith of the clergy from the pope downwards. The source of all the evil was, he declared, the excessive wealth of the church, which, in retaliation for the sentence of excommunication, he threatened to confiscate. In vain the mediation of the saintly king of France, Louis IX., was invoked. Innocent surpassed his predecessors in the ferocity and unscrupulousness of his attacks on the emperor (see INNOCENT IV.). War soon became general in Germany and Italy. Henry Raspe, landgrave of Thuringia, was chosen German king in opposition to Frederick in May 1246, but neither he nor his successor, William II., count of Holland, was successful in driving the Hohenstaufen from Germany. In Italy, during the emperor's absence, his cause had been upheld by Enzio and by the ferocious Eccelino da Romano. In 1246 a formidable conspiracy of the discontented Apulian barons against the emperor's power and life, fomented by papal emissaries, was discovered and crushed with ruthless cruelty. The emperor's power seemed more firmly established than ever, when suddenly the news reached him that Parma, a stronghold of the imperial authority in the north, had been surprised, while the garrison was off its guard, by the Guelphs. To recover the city was a matter of prime importance, and in 1247 Frederick concentrated his forces round it, building over against it a wooden town which, in anticipation of the success that astrologers had predicted, he named Vittoria. The siege, however, was protracted, and finally, in February 1248, during the absence of the emperor on a hunting expedition, was brought to an end by a sudden sortie of the men of Parma, who stormed the imperial camp. The disaster was complete. The emperor's forces were destroyed or scattered; the treasury, with the imperial insignia, together with Frederick's harem and some of the most