Otto's cause had been linked with that of his uncle John, over whom Innocent won the greatest of his victories. On a vacancy in the see of Canterbury (1206) the right of election was disputed, as usual, between the monks of the monastery of Christchurch at Canterbury and the bishops of the province. King John thrust in his nominee. Innocent settled the matter by making an appointment of his own. But John refused to accept Stephen Langton; and Innocent proceeded to force his consent. In 1208 the country was laid under an interdict; and John treated the bishops who published it as Philip Augustus had treated the French bishops ten years before. In 1209 Innocent excommunicated John, and in 1212 declared him deposed. Despite the continued obstinacy of Philip of France in the matter of Ingebiorg, Innocent called upon him to execute the papal sentence; and Philip, thinking that the aid of Denmark would be useful, ended the twenty years' dispute and accorded to Ingebiorg the position of Queen for the rest of his reign. It was certainly a measure of the growing strength of the royal power in France that it had been able to defy the Papacy for so long in a matter in which the King was so clearly in the wrong. Philip's threatened attack brought John to his knees; and in 1213 he not only accepted Stephen Langton, but even surrendered his kingdom to the Papacy to receive it back as a papal fief, and undertook to pay an annual tribute. The sequel was not quite so satisfactory for Innocent. The surrender to the Pope and the defeat at Bouvines so enraged the barons and clergy in England that they combined to force John to sign Magna Carta (1215). But John was now under the protection of the Pope; and although Innocent's own archbishop took the lead in the movement against John, Innocent issued a bull in condemnation of the charter; but so long as John lived, even the interdict and excommunication which followed failed to move the barons. Innocent's successors reaped the benefit of his triumph in the influence which they were able to exert in England during the greater part of the reign of Henry III. [Sidenote: Innocent's successes in Europe.] Nor was John the only King who laid his crown at the feet of the Pope. Peter, King of Aragon, hoped to escape the claims of the King of Castile and the tyranny of his own barons by making his kingdom tributary to the Papacy. Prince John of Bulgaria actually asked for and obtained a royal crown from Innocent. The struggles of Sancho, King of Portugal, to free himself from the submission made by a predecessor ended in failure. Leo, King of Armenia, sought the papal protection against the crusaders. The King of Denmark appealed to Innocent on behalf of his much-wronged sister. The contending parties in Hungary listened to his mediation.