I, Boniface, by the grace of God bishop, promise thee, St. Peter, prince of the apostles, and thy vicar, blessed pope Gregory, and his successors, through the Father, Son, and Holy Spirit, the inseparable Trinity, and on this thy most holy body, that I will hold the holy Catholic faith in all its purity, and by the help of God I will remain in unity with it, without which there is no salvation. I will in no way consent to anyone who acts against the unity of the church, but, as I have said, I will preserve the purity of my faith and give my support to thee [St. Peter] and to thy church, to which God has given the power of binding and loosing, and to thy vicar, and to his successors. And if I find out that any bishops are acting contrary to the ancient rules of the holy fathers, I will have no communion or association with them, but I will restrain them as far as I can. But if I cannot restrain them I will report it at once to my lord the pope. And if I shall ever in any way, by any deceit, or under any pretext, act contrary to this my promise, I shall be found guilty in the day of judgment, and shall suffer the punishment of Ananias and Sapphira, who presumed to try to deceive thee about their possessions and to lie to thee. This text of my oath, I, Boniface, unworthy bishop, have written with my own hand, and have placed it over the most holy body of St. Peter; before God as my witness and judge, I have taken this oath, which also I promise to keep. 41-42. The Rebellion of the Popes against the Emperor. 41. Letter of Pope Gregory II to the Emperor, Leo III, 726 or 727. Migne, 89, cols. 521 ff. From the days of Constantine the Great the emperors assumed and actually exercised extensive authority over the church, presuming even to dictate in matters which concerned the doctrine and practice of the church. Since the emperor often supported doctrines which the bishop of Rome held to be heretical, the relations between him and the pope became more and more strained. The harsh way in which the emperors treated the popes who resisted them angered the papal adherents. There were other reasons also why the rule of the emperor was disliked in Rome, and so it soon came about that the people of Rome, and even of central Italy, looked upon the pope as the head of the opposition to the emperor and heartily supported him when he rebelled against the Greek rule. The emperors met with increasing resistance when they interfered with the bishop of Rome. Pope Vigilius (547-554) was humiliated and deposed by Justinian and died in exile. Because Martin I (649-655) resisted the emperor in a doctrinal matter, Constans II (642-668) had him brought as a prisoner to Constantinople (653) and afterward exiled him to the Crimea. But Sergius I (687-701) successfully resisted the emperor and escaped arrest and deposition because the people of central Italy supported him and threatened to revolt if the emperor should seize and carry away their pope.