and free them from the bonds of all their sins by the authority of the holy apostles Peter and Paul." I, Nicholas, bishop of the holy Catholic and apostolic church, have subscribed this decree which has been promulgated by us, as said above. I, Boniface, by the grace of God bishop of Albano, have subscribed. I, Humbert, bishop of the holy church of Silva Candida, have subscribed. I, Peter, bishop of the church of Ostia, have subscribed. And other bishops to the number of seventy-six, with priests and deacons. {71} The seven cardinal bishops were those of Palæstrina, Porto, Ostia, Tusculum, Silva Candida, Albano, and Sabina. III. THE STRUGGLE BETWEEN THE EMPIRE AND THE PAPACY, 1073-1250 60-64. Prohibition of Simony, Marriage of the Clergy, and Lay Investiture, 1074-1123. According to Roman ideas religion and its ministers were a part of the state and hence under the control of the government. When Constantine made Christianity a legal religion the state took the same attitude toward the new religion that it had toward the old. The emperor assumed control over the Christian clergy, and the view soon prevailed that they were officials of the state. Their duties, which were at first purely spiritual, were soon extended to secular matters. For obvious reasons the bishops were given an oversight over the administration of justice. During the invasions of the barbarians the secular functions of the bishops were greatly increased. Karl the Great made constant use of the bishops in the administration of his realm. By the tenth century many bishops were intrusted to a large extent with the secular government of their dioceses and so were full-fledged officials of the state. Attendance on diets was required of all officials, and eventually it was required only of officials. So it came about that the bishops especially formed an important part of the diet. Because of their learning they were indispensable to the emperor in conducting the affairs of his court and government; they naturally became his chief advisers. The bishops, then, have two sets of functions, the one spiritual, the other secular. Through bequests and gifts from various sources the clergy, and especially the bishops and chief abbots, became great landholders. Many gave to the clergy for religious reasons, such as the salvation of their souls. But the emperors had still other motives: because of their office as emperor they were bound to build up the church; they felt it to be their duty to reward and to strengthen the clergy who were their faithful officials; and, furthermore, since they frequently met with opposition from the lay nobility, they thought it advisable to build up a strong ecclesiastical nobility to serve as a check upon the former. As all other offices and relations became feudalized, so all the clergy underwent the same process. The bishops became the vassals of the emperor, and sustained the same feudal relations to him as did the lay nobility.