When Leo the Isaurian attempted, in the eighth century, to repress the worship of images, the resistance which he met at Constantinople, though violent, was speedily allayed; but the Pope, assuming a far higher position than any Byzantine ecclesiastic could attain, boldly excommunicated the emperor, and led a revolt against his authority, which resulted in the virtual independence of Italy. His position was at this time singularly grand. He represented a religious cause to which the great mass of the Christian world were passionately attached. He was venerated as the emancipator of Italy. He exhibited in the hour of his triumph a moderation which conciliated many enemies, and prevented the anarchy that might naturally have been expected. He presided, at the same time, over a vast monastic organisation, which ramified over all Christendom, propagated his authority among many barbarous nations, and, by its special attachment to the Papacy, as distinguished from the Episcopacy, contributed very much to transform Christianity into a spiritual despotism. One great danger, however, still menaced his power. The barbarous Lombards were continually invading his territory, and threatening the independence of Rome. The Lombard monarch, Luitprand had quailed in the very hour of his triumph before the menace of eternal torture but his successor, Astolphus, was proof against every fear, and it seemed as though the Papal city must have inevitably succumbed before his arms. In their complete military impotence, the Popes looked abroad for some foreign succour, and they naturally turned to the Franks, whose martial tastes and triumphs were universally renowned. Charles Martel, though simply a mayor of the palace, had saved Europe from the Mohammedans, and the Pope expected that he would unsheath his sword for the defence of the Vatican. Charles, however, was deaf to all entreaties; and, although he had done more than any ruler since Constantine for the Church, his attention seems to have been engrossed by the interests of his own country, and he was much alienated from the sympathies of the clergy. An ancient legend tells how a saint saw his soul carried by dæmons into hell, because he had secularised Church property, and a more modern historian(545) has ascribed his death to his having hesitated to defend the Pope. His son, Pepin, however, actuated probably in different degrees by personal ambition, a desire for military adventure, and religious zeal, listened readily to the prayer of the Pope, and a compact was entered into between the parties, which proved one of the most important events in history. Pepin agreed to secure the Pope from the danger by which he was threatened. The Pope agreed to give his religious sanction to the ambition of Pepin, who designed to depose the Merovingian dynasty, and to become in name, as he was already in fact, the sovereign of Gaul.