The office of bishop of Rome assumed to some extent a political character as early as the time of the first Christian emperors. By them this prelate was constituted a sort of secretary of state for Christian affairs, and was employed as a central authority for communicating with the bishops in the provinces; so that after a while he acted as minister of religion and public instruction. As the civil and military power of the Western Empire declined, the extent of this authority increased; and by the time when Italy was annexed to the Empire of the East, in the reign of Justinian, the popes had become the political chiefs of Roman society. Nominally, indeed, they were subject to the exarch of Ravenna, as vicegerent of the Emperor at Constantinople, but in reality the inhabitants of Western Europe were more disposed to look to the spiritual potentate in the Imperial city as representing the traditions of ancient Rome. The political rivalry that was thus engendered was sharpened by the traditional jealousy of Rome and Constantinople, which had existed ever since the new capital had been erected on the shores of the Bosporus. Then followed struggles for administrative superiority between the popes and the exarchs, culminating in the shameful maltreatment and banishment of Martin I by the emperor Constans--an event which the See of Rome could never forget. The attempt to enforce iconoclasm in Central Italy was influential in causing the loss of that province to the Empire; and even after the Byzantine rule had ceased there, the controversy about images tended to keep alive the antagonism, because, although that question was once and again settled in favor of the maintenance of images, yet many of the emperors, in whose persons the power of the East was embodied, were foremost in advocating their destruction. Indeed, from first to last, owing to the close connection of church and state in the Byzantine empire, the unpopularity of the latter in Western Europe was shared by the former. To this must be added the contempt for one another's character which had arisen among the adherents of the two churches, for the Easterns had learned to regard the people of the West as ignorant and barbarous, and were esteemed by them in turn as mendacious and unmanly.