After the death of Urban, Pascal II. became pope, and the empire was under the dominion of Henry IV. who came to Rome pretending friendship for the pontiff but afterward put his holiness and all his clergy in prison; nor did he release them till it was conceded that he should dispose of the churches of Germany according to his own pleasure. About this time, the Countess Matilda died, and made the church heir to all her territories. After the deaths of Pascal and Henry IV. many popes and emperors followed, till the papacy was occupied by Alexander III. and the empire by Frederick, surnamed Barbarossa. The popes during this period had met with many difficulties from the people of Rome and the emperors; and in the time of Barbarossa they were much increased. Frederick possessed military talent, but was so full of pride that he would not submit to the pontiff. However, at his election to the empire he came to Rome to be crowned, and returned peaceably to Germany, where he did not long remain in the same mind, but came again into Italy to subdue certain places in Lombardy, which did not obey him. It happened at this time that the cardinal St. Clement, of a Roman family, separated from Alexander, and was made pope by some of the cardinals. The Emperor Frederick, being encamped at Cerma, Alexander complained to him of the anti-pope, and received for answer, that they were both to go to him, and, having heard each side, he would determine which was the true pope. This reply displeased Alexander; and, as he saw the emperor was inclined to favor the anti-pope, he excommunicated him, and then fled to Philip, king of France. Frederick, in the meantime, carrying on the war in Lombardy, destroyed Milan; which caused the union of Verona, Padua, and Vicenza against him for their common defense. About the same period the anti-pope died, and Frederick set up Guido of Cremona, in his stead.