Karl, by the grace of God king, of the Franks and Lombards, and patricius of the Romans, to his holiness, pope Leo, greeting.... Just as I entered into an agreement with the most holy father, your predecessor, so also I desire to make with you an inviolable treaty of mutual fidelity and love; that, on the one hand, you shall pray for me and give me the apostolic benediction, and that, on the other, with the aid of God I will ever defend the most holy seat of the holy Roman church. For it is our part to defend the holy church of Christ from the attacks of pagans and infidels from without, and within to enforce the acceptance of the catholic faith. It is your part, most holy father, to aid us in the good fight by raising your hands to God as Moses did [Ex. 17:11], so that by your intercession the Christian people under the leadership of God may always and everywhere have the victory over the enemies of His holy name, and the name of our Lord Jesus Christ may be glorified throughout the world. Abide by the canonical law in all things and obey the precepts of the holy fathers always, that your life may be an example of sanctity to all, and your holy admonitions be observed by the whole world, and that your light may so shine before men that they may see your good works and glorify your father which is in heaven [Matt. 5:16]. May omnipotent God preserve your holiness unharmed through many years for the exalting of his holy church. 48. Karl the Great Exercises Authority in Rome, 800. Einhard's Annals, M. G. SS. folio, I, p. 188. The title of patricius of Rome was somewhat vague and it is impossible to say exactly how much actual authority attached to it. But it is evident from Karl's conduct that he regarded himself as responsible for the government of Rome. The passage from Einhard's Annals shows that Karl was the supreme authority in legal matters there. He acted as judge even in the case of the pope. There was no one willing to make a formal charge against Leo, and hence he might have been declared innocent. But he was not willing to receive that sort of acquittal. So of his own accord he took an oath to his innocence.