The struggle about the use of images gave the popes an opportunity to rebel and assert their complete independence of the emperor. In 726 the emperor, Leo III, began to condemn the presence and use of images in the churches. He met with great resistance, especially in the west, where pope Gregory II vigorously defended the images. There followed a heated controversy, in the course of which the pope laid down the principle that the emperor has no authority in ecclesiastical matters. In the letter here given Gregory II asserts his independence and practically excommunicates the emperor. And Gregory III published a general excommunication of all iconoclasts, as those who destroyed images were called. The emperor was of course included in this excommunication. Peace was never again established between the pope and emperor, and the rebellion of the west was consummated in 800 when pope Leo III crowned Karl the Great emperor. We have received the letter which you sent us by your ambassador Rufinus. We are deeply grieved that you should persist in your error, that you should refuse to recognize the things which are Christ's, and to accept the teaching and follow the example of the holy fathers, the saintly miracle-workers and learned doctors. I refer not only to foreign doctors, but also to those of your own country. For what men are more learned than Gregory the worker of miracles, Gregory of Nyssa, Gregory the theologian, Basil of Cappadocia, or John Chrysostom--not to mention thousands of others of our holy fathers and doctors, who, like these, were filled with the spirit of God? But you have followed the guidance of your own wayward spirit and have allowed the exigencies of the political situation at your own court to lead you astray. You say: "I am both emperor and bishop." But the emperors who were before you, Constantine the Great, Theodosius the Great, Valentinian the Great, and Constantine the father of Justinian, who attended the sixth synod, proved themselves to be both emperors and bishops by following the true faith, by founding and fostering churches, and by displaying the same zeal for the faith as the popes. These emperors ruled righteously; they held synods in harmony with the popes, they tried to establish true doctrines, they founded and adorned churches. Those who claim to be both emperors and priests should demonstrate it by their works; you, since the beginning of your rule, have constantly failed to observe the decrees of the fathers. Wherever you found churches adorned and enriched with hangings you despoiled them. For what are our churches? Are they not made by hand of stones, timbers, straw, plaster, and lime? But they are also adorned with pictures and representations of the miracles of the saints, of the sufferings of Christ, of the holy mother herself, and of the saints and apostles; and men expend their wealth on such images. Moreover, men and women make use of these pictures to instruct in the