The pope cast all the odium on the emperor Frederick, a man who had thrice sworn to redeem the Holy Land, and had compromised with his conscience by merely sending soldiers and provisions. Frederick despised the thunders of the Vatican; but although he was not awed by force, he could not resist papal artifice. Honorius soothed his irritated mind, and received him again as a faithful son of the church. Hermann von Salza, master of the Teutonic order, returned to Europe, and gave the emperor the hope of being the redeemer of Palestine. Yolande, the daughter of the king of Jerusalem, could easily be obtained in marriage, and her father would cede his rights, which he was wearied of endeavouring to convert into an actual and firm dominion. The emperor and the pope approved of this project. Frederick accepted from the king of Jerusalem a renunciation of all his claims to the Holy Land, as the dowry of Yolande; and he pledged his honour to the pope, the cardinals, and the masters of the Hospitallers and Teutonic knights, that he would within two years travel with a powerful army into the East, and re-establish the throne of Godfrey de Bouillon. For the succeeding five years, rebellions in Italy, and the insurrections of the Saracens in Sicily, detained the emperor from his purpose. Honorius did not live to witness the event of his exertions, but his successor, Gregory IX, was equally furious in the cause.
At the time appointed for the sailing of the expedition, Brundusium and its vicinity were crowded with soldiers. But the heats of summer destroyed the health of the people of the north; thousands died, and of those who endeavoured to return to their homes, the greatest part perished through poverty or disease. Although the emperor did not escape the common illness, yet he embarked at Brundusium. But after sailing for three days, additional infirmity compelled him to return. Gregory inherited the papal virtues of violence and ambition; he pronounced a sentence of excommunication against the emperor, for declining to combat the enemy of God.[71]
[1227-1229 A.D.]
The thunders of the Vatican rolled again and again over the head of the emperor, but the author of them suffered more than the object. The emperor sent troops into the papal territories, who ravaged the march of Ancona, and the patrimony of St. Peter. Such of the Hospitallers and Templars (the firm friends of the pope) as had estates in the imperial dominions in Italy, were plundered and dispossessed.[72] The emperor heavily taxed his subjects, both churchmen and laity, for the expenses of the holy war. In defiance of Gregory’s warnings against his entering on the crusade, till he should be relieved from the censures of the church, Frederick embarked at Brundusium in August, 1228, and arrived shortly afterwards at Acre. The joy of the Christians at the arrival of the emperor was soon checked by letters which the patriarch received from the pope, prohibiting the faithful from obeying a rebellious son of the church. The Teutonic knights feared no clerical censures; and at their head, and of some other soldiers, the emperor quitted Acre, went to Joppa, and repaired the fortifications of that important city. He then made further advances towards Jerusalem.