Immediately on his elevation, Pope Leo sent messengers to Charles announcing his election and carrying to him the keys of St. Peter’s tomb and the banner of the city of Rome. This act of submission to the great Patrician of Rome, to whom the pope looked for confirmation of his rights and protection from his enemies, was represented in the celebrated mosaic in the Triclinium of the Lateran palace, of which a tolerably accurate seventeenth-century copy still exists on the outside wall of the oratory called the _Sancta Sanctorum_, immediately in front of the Lateran. In it the Apostle Peter, of colossal size, is represented sitting with the keys on his lap. Before him, on his right, kneels Pope Leo, to whom he is giving the _pallium_; on his left “our lord Carulus,” to whom he gives a banner; and underneath is an inscription in barbarous Latin stating that the blessed Peter gives life to Pope Leo and victory to King Charles. Charles is represented as wearing a moustache, but no beard. He has a broad pleasant face and is crowned with a conical diadem. The Frankish king replied to the new pope by sending to him his friend and chaplain Angilbert, bearing a letter in which he dilated on the various duties which Providence had assigned to its sender and its receiver. “It is ours with the help of the divine piety externally to defend the Holy Church of Christ by our arms from all pagan inroads and infidel devastation, and internally to fortify it by the recognition of the Catholic faith. It is yours, most holy father, with hands raised to God like Moses, to help our warfare; that by your intercession the Christian people may everywhere have the victory over its enemies, and the name of our Lord Jesus Christ may be magnified throughout the whole world.” At the same time Angilbert brought the share of the Avar booty which Charles had set aside for Hadrian, but which came too late to gladden the heart of the aged pontiff.