Louis, in 1326, became reconciled with Frederic of Austria and was recognized in Germany as sole Emperor, but John had gone too far to withdraw, or was too deeply involved with Charles of France and Robert of Naples. In alliance with the Ghibellines, Louis made a triumphant tour over Italy, and on April 18, 1328, to the immense joy of his throng of rebel supporters, solemnly declared, in St. Peter's, that "James of Cahors" was guilty of heresy and treason.[263] Friar Peter of Corbara was substituted for him, with the name of Nicholas V., and Rome exulted in the restoration of the Papacy. But the drama ended as it had often ended before. Louis oppressed the country and alienated his supporters; and before the end of the year Friar Peter was, with a halter round his neck, at the Pope's feet in Avignon and Louis was back in Germany. John refused to compromise honourably with Louis, and the agitation against the Papacy in Germany, whither all the rebels had now gone, was more bitter than ever. The next phase of the struggle is not wholly clear. John of Bohemia intervened and overran Italy. It seems probable that the Pope had nothing to do with this invasion, and at first suspected that John was in league with Louis; but that, as John made progress and had friendly communication with Avignon, the Pope began to hope that the new development offered him a stronger King of Italy (under Papal suzerainty) than Robert and a less oppressive protector than Philip VI. of France.[264] Philip and John visited the Pope at Avignon, and it was announced that John was to be recognized as King of part of Italy. The curious alliance of the three reveals some miscalculation. Philip must have trusted that John of Bohemia would work for him, but the Pope had assuredly no idea of abandoning his claim to Italy. The issue was singular. The Italians, in face of this alliance, united under Robert of Naples and overcame the Papal and Bohemian troops. John had, as part of the campaign, announced his intention of transferring the Papal Court to Bologna, and the Legate actually began to erect a palace for him. When the Bolognese realized that John had no serious intention of coming, they joined the Imperialists and cast out the Legate and his troops. It is said that the collapse of his costly Italian campaign weighed so heavily on the Pope that he did not leave his palace during the year of life which still remained.