Gregory VII, in accordance with his political pretensions, endeavored to compel all rulers of the Christian world to acknowledge his supremacy over them. He made the broadest claims to the proprietorship of all kingdoms, duchies, counties, etc., and tried to compel all rulers of every rank to take an oath of vassalage to him and to receive their lands from him as fiefs. Nos. 68-73 illustrate this feature of his policy. I, Richard, by the grace of God and St. Peter prince of Capua, from this time forth will be faithful to the holy Roman church, to the apostolic see, and to you, pope Gregory. I will have no share in any plan or any deed to injure you in life or limb or to make you captive. Any plan which you may confide to me, wishing it to be kept secret, I will never divulge consciously to your injury. I will faithfully aid you and the holy Roman church to keep, acquire, and defend the regalia and the possessions of St. Peter against all men and I will assist you to hold the papacy and the lands of St. Peter in peace and honor. I will never attempt to attack, seize, or devastate any lands without the express permission of you or your successors, except such lands as you or your successors may have given to me. I promise to pay to the Roman church the legal tribute from the lands of St. Peter, which I hold or shall hold. I will surrender to your authority all the churches which are in my lands, with all their goods, and I will defend them in their fidelity to the holy Roman church. I will swear fidelity to king Henry whenever I shall be commanded to do so by you or your successors, always saving my fidelity to the holy Roman church. If you or any of your successors shall die before I do, I will support the better part of the cardinals and the clergy and the people of Rome in the election and establishment of a new pope to the honor of St. Peter. I will keep all the above promises to you and to the holy Roman church in good faith, and I will keep my oath of fidelity to your successors who shall be ordained popes, if they are willing to confirm the investiture which you have conferred upon me. 69. Letter of Gregory VII to the Princes Wishing to Reconquer Spain, 1073. Migne, 148, cols. 289 f. See introductory note to no. 68. Gregory, pope elect, to all the princes desiring to go into Spain, perpetual greeting in the Lord Jesus Christ.