It had not been uncommon for the popes to send their legates on missions to various parts of the world, but Gregory VII made a far more frequent use of them than any of his predecessors. He practically ruled the church through them and demanded that they be received and obeyed by all. This letter shows his general attitude on the matter, the authority he gave them, and the reception which he expected them to have.
Gregory, bishop, servant of the servants of God, to all the faithful subjects of St. Peter, to whom these presents come, greeting and apostolic benediction.
You see that wickedness is increasing and that the wiles of the devil are prevailing in the earth, that Christian charity has grown cold and religious zeal has almost disappeared within the church. But since we cannot be everywhere present in person to attend to all these matters, we have sent to you two beloved sons of the holy Roman church, Geizo, abbot of St. Boniface, and Maurus, abbot of St. Sabba, who shall represent us to you and have authority to do in our name whatever may be to the advantage of the church. Remember therefore that saying of the gospel: "He that heareth you heareth me; and he that despiseth you despiseth me" [Luke 10:16]. As you care for the friendship and for the favor of St. Peter, whose messengers they are, receive them with the proper reverence and kindness, and obey them in all matters which may arise as part of their mission or through the exigencies of the situation among you. If it becomes necessary or expedient for the legates to separate and go to different regions, each one of them shall be received and obeyed as our representative.
67. Oath of the Patriarch of Aquileia to Gregory VII, 1079 A.D.
Mansi, XX, p 525.
Gregory VII required an oath of fidelity from all bishops. By comparing the oath of Boniface to Gregory II ([no. 40]) and the oath of Richard of Capua ([no. 68]) with this oath of the patriarch of Aquileia, interesting light will be thrown on the theory and practice of Gregory VII.
From now henceforth I will be faithful to St. Peter and to pope Gregory [VII] and to his successors who shall be elected by the better cardinals. Neither in counsel nor in deed will I do anything to cause them to lose their life, or limb, or the papacy, or that they be taken prisoner through any treacherous trick. To whatsoever synod they, either in person or by messenger or by letter, may call me, I will come and I will obey them according to the law; or if I shall not be able to come, I will send my representative. I will aid and defend them in holding and defending the papacy and the regalia of St. Peter, saving the duties of my position. If they, either in person or by messenger or by letter, shall intrust me with a secret, I will not knowingly reveal it to anyone to their harm. I will treat with honor a papal legate, whether coming [from Rome] or going [back to Rome], and I will give him my aid whenever he needs it. I will not wittingly associate with any whom the pope has excommunicated. Whenever I shall have been called on I will aid the Roman church with my military forces. All these duties I will perform unless I shall have been excused from them.
68–73. Gregory VII Exercises Secular Authority.
68. The Oath of Fidelity which Richard, Prince of Capua, Swore to Gregory VII, 1073.
Migne, 148, col. 304.