About this time Frederick returned to Italy, and while he was preparing to carry on new wars against the pope, his prelates and barons declared that they would abandon him unless he reconciled himself with the church; so that he was obliged to go and submit to the pope at Venus, where a pacification was effected, but in which the pope deprived the emperor of all authority over Rome, and named William, king of Sicily and Puglia, a coadjutor with him. Frederick, unable to exist without war, joined the crusaders in Asia, that he might exercise that ambition against Mohammed, which he could not gratify against the vicars of Christ. And being near the river Cydnus, tempted by the clearness of its waters, bathed therein, took cold, and died. Thus the river did a greater favor to the Mohammedans than the pope's excommunications had done to the Christians; for the latter only checked his pride, while the former finished his career. Frederick being dead, the pope had now only to suppress the contumacy of the Romans; and, after many disputes concerning the creation of consuls, it was agreed that they should elect them as they had been accustomed to do, but that these should not undertake the office, till they had first sworn to be faithful to the church. This agreement being made, Giovanni the anti-pope took refuge in Mount Albano, where he shortly afterward died. William, king of Naples, died about the same time, and the pope intended to occupy that kingdom on the ground that the king had left only a natural son named Tancred. But the barons would not consent, and wished that Tancred should be king. Celestine III., the then pope, anxious to snatch the kingdom from the hands of Tancred, contrived that Henry, son of Frederick should be elected emperor, and promised him the kingdom on the condition that he should restore to the church all the places that had belonged to her. To facilitate this affair, he caused Gostanza, a daughter of William, who had been placed in a monastery and was now old, to be brought from her seclusion and become the wife of Henry. Thus the kingdom of Naples passed from the Normans, who had been the founders of it, to the Germans. As soon as the affairs of Germany were arranged, the Emperor Henry came into Italy with Gostanza his wife, and a son about four years of age named Frederick; and, as Tancred was now dead, leaving only an infant named Roger, he took possession of the kingdom without much difficulty. After some years, Henry died in Sicily, and was succeeded in the kingdom by Frederick, and in the empire by Otho, duke of Saxony, who was elected through the influence of Innocent III. But as soon as he had taken the crown, contrary to the general expectation, he became an enemy of the pope, occupied Romagna, and prepared to attack the kingdom. On this account the pope excommunicated him; he was abandoned by every one, and the electors appointed Frederick, king of Naples, emperor in his stead.