As the young man grew up he found himself in conflict with his guardian. Innocent III wanted altogether too much from his ward. When the opportunity came for Frederick to succeed as Emperor, the Pope intervened with conditions. Frederick must promise to put down heresy in Germany with a strong hand. Moreover he must relinquish his crown in Sicily and South Italy, because otherwise he would be too strong for the Pope. And the German clergy were to be freed from all taxation. Frederick agreed but with no intention of keeping his word. The Pope had already induced the French King to make war upon his own subjects in France, the cruel and bloody crusade against the Waldenses; he wanted Frederick to do the same thing in Germany. But Frederick being far more of a heretic than any of the simple pietists who had incurred the Pope’s animosity, lacked the crusading impulse. And when Innocent urged him to crusade against the Moslim and recover Jerusalem he was equally ready to promise and equally slack in his performance. A TYPICAL CRUSADER: DON RODRIGO DE CARDENAS A TYPICAL CRUSADER: DON RODRIGO DE CARDENAS From the Church of S. Pedro at Ocana, Spain _(In the Victoria and Albert Museum)_ Having secured the imperial crown Frederick II stayed in Sicily, which he greatly preferred to Germany as a residence, and did nothing to redeem any of his promises to Innocent III, who died baffled in 1216. Honorius III, who succeeded Innocent, could do no better with Frederick, and Gregory IX (1227) came to the papal throne evidently resolved to settle accounts with this young man at any cost. He excommunicated him. Frederick II was denied all the comforts of religion. In the half-Arab Court of Sicily this produced singularly little discomfort. And also the Pope addressed a public letter to the Emperor reciting his vices (which were indisputable), his heresies, and his general misconduct. To this Frederick replied in a document of diabolical ability. It was addressed to all the princes of Europe, and it made the first clear statement of the issue between the Pope and the princes. He made a shattering attack upon the manifest ambition of the Pope to become the absolute ruler of all Europe. He suggested a union of princes against this usurpation. He directed the attention of the princes specifically to the wealth of the church.