Then it lay in the hand of the Pope to put an end to Byzantine dominion in central Italy. The exarchate was in Liutprand’s possession. Had Gregory II. come to terms with him, the Pope would have obtained a free hand over the duchy of Rome. It already refused tribute to the emperor; in arms repulsed his troops, frustrated the repeated attempts upon the freedom and life of Gregory II., and bound itself under oath to protect him. The city of Rome expelled the imperial duke, and seems to have given itself a municipal government. It was the desire of the cities on the Adriatic to substitute an orthodox for an heretical emperor. Had the Pope put himself at the head of this revolt, the emperor’s power was at an end. He did it not. He maintained the purity and the freedom of the faith against imperial interference; but he urged the population to continue their allegiance to the sovereign. No stronger proof of this can be given than a letter of the Pope to Ursus, doge of Venice, in these words: “Gregory, the bishop, servant of the servants of God, to Ursus, duke of Venice. Since by sinful action the city of Ravenna, the head of all, has been captured by that unutterable race of Lombards, and our son, the noble lord the exarch, is, as we know, sojourning at Venice, your nobility should support him, and maintain his cause, as we do, that the city of Ravenna may return to the former condition of the sacred commonwealth, as belonging to the domain of our lords and sons, the high emperors Leo and Constantine. So by the help of the Lord we may be able to remain firm, by zeal and love to our holy faith, in the commonwealth and the imperial service. God preserve you in safety, beloved son.”(175) This conduct could not fail to endanger the Pope’s position with king Liutprand. In the year 728 the strangest scene of this perplexed time took place. The Lombard king appeared with his host before Rome. Pope Gregory II. visited him in his camp, and exercised such influence over him that the king desisted from the siege, went as pilgrim to the Apostle’s tomb, and left as gifts there his crown, his arms, and his mantle.