Since Frederick could not stop Otto's progress in the south, it was arranged that he should go north to Germany in the hope of drawing Otto away. Before he left, Frederick had his young child Henry crowned, as an earnest that he did not intend to join the kingdom he was going to seek with that which he already held. He passed through Rome on his way north, and Innocent obtained from him a repetition of his liege homage for Sicily and a promise that the two kingdoms should be kept separate. In return Innocent gave him the title of "Emperor elect by the grace of God and of the Pope," and supplied him with money. Innocent thus hoped that he had taken every precaution to avoid the dangers which he feared, while Frederick, young and inexperienced, seems to have accepted the conditions willingly and to have intended to keep them. His ambition and the unexpected prospects thus opened to him led him on regardless of consequences.
[Sidenote: Otto's failure.]
Frederick's move was perfectly successful. Otto rushed back to Germany, and the death of his wife Beatrice did away with any obligations of loyalty which the partisans of the Hohenstaufen might have felt towards him. Frederick was elected and crowned (December, 1212), and renewed the old Hohenstaufen league with France. Otto turned for help to his uncle, John of England. John was excommunicate, but now made his peace with the Pope. Philip, at first encouraged by Innocent to attack England and then after John's submission forbidden to go, turned his arms against Flanders. A coalition was formed against him, and was joined by John and by Otto; but Philip's victory at Bouvines (July, 1214) broke up the coalition and put an end to Otto's hopes. For the four years of life which remained to him his power was confined to Brunswick.
[Sidenote: Frederick's acceptance.]
Meanwhile Frederick had, as it were, put the crown upon his work of submission to the Papacy. By the Golden Bull (July, 1213), he repeated the promises which Otto had made at Neuss in 1201 with the additions of 1209. In 1215 he went through a second and more formal coronation at Aachen, and took the cross in conjunction with a number of German nobles. In 1216 he further promised, in a formal deed, that in return for the imperial crown his son Henry should become King of Sicily, entirely independently from himself and under the supremacy of the Roman Church. Thus Frederick in his eagerness put himself completely in the hands of the Papacy.
[Sidenote: Innocent and England.]
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.
But we have already seen that Innocent was not always successful, and that most of his successes were won only after a prolonged contest. Their matrimonial irregularities brought him into conflict with nearly all the Christian Kings of Spain, and the kingdom of Leon was struck by an interdict which was not removed for five years. It was a more serious matter for the future that the papal acts for the first time roused the opposition of the people in more than one instance; while it is right to notice that Innocent often got acknowledgment of his claim to adjudicate by accepting what had already been done. But despite some notable failures, he did meet with considerable success; and since he got so much, it is not surprising that he aimed at more. Perhaps the greatest disappointment of his life was the failure of the Fourth Crusade. Innocent found some compensation in the great victory won by the united chivalry of Spain and France over the Almohades on the field of Las Navas de Tolosa in 1212. But he is responsible for inventing a new kind of crusade—that of Christians against Christians—in the undoubtedly papal duty of dealing with the Albigensian heretics; and it is, in modern eyes at least, a small condonation that he encouraged the founder of the Dominicans and received Francis of Assisi with sympathy.