So the Pope disarmed a second time the most powerful of the Lombard kings, and saved the exarchate for the empire. From that time Liutprand lived in peace with the Romans and the Ravennese. He did not live to receive the report of the ambassadors whom he had sent to Constantinople to inform the emperor of the peace thus given to Ravenna. He closed in the next year, 744, his reign of thirty-two years, the longest in the Lombard series, and that in which the Lombard kingdom most developed its power. It must be confessed that the power of religion was great over the mind of Liutprand. He reverenced Pope Gregory II. under the walls of Rome: he listened to the voice of Pope Zacharias in the interviews of Terni and Pavia. At the bidding of the Vicar of Christ, he more than once stopped himself in the middle of his victories, and renounced the greatest desire of his heart. Hildebrand, Liutprand’s co-regent, and successor, maintained himself only a few months, and had to resign the crown before the end of the year 744 to Rachis, duke of Friuli. A good understanding seemed to be established with the Pope under a king renowned for piety, married to a Roman, who made rich offerings to the Church. Peace was assured with the Roman duchy. But after a few years Rachis also was in conflict with the exarchate. In 749 a new war burst out in central Italy. The king of the Lombards came in great wrath and with a valiant army to besiege Perugia. Then once more Pope Zacharias appeared. Attended by some clergy and chief people of Rome he went to the camp at Perugia. His gifts and his prayers so prevailed with King Rachis that he consented to raise the siege of the city and return in peace to Pavia. But the king had been so moved by the words of Pope Zacharias that after a few days he resigned his kingdom. With his queen Tassia and his daughter Ratruda he came like a pilgrim to Rome to venerate the tomb of St. Peter and to ask admission among the clergy. The Pope cut off the long hair of the Lombard king, gave him with his own hands the clerical tonsure, and vested him, as well as his wife and daughter, in the habit of St. Benedict. He retired, by the Pope’s suggestion, to Monte Cassino, which had been restored by the abbot Petronax from its ruin towards the end of the sixth century. With him also retired the prince Carloman, younger brother of King Pipin, and a Benedictine as well as Rachis. Pope Zacharias greatly loved that monastery, enriched it with gifts and books, and exempted it from all episcopal jurisdiction, subjecting it immediately to the Holy See.