Although the pope needed the help of the king of the Germans, and was willing to confer upon him the title of emperor, yet he was afraid that Otto might assume too much authority and deprive the papal office of much of its power. He accordingly attempted to secure his position by demanding the following oath of Otto. It will be observed that Otto did not take the oath in person but sent his representative to take it for him. It was, nevertheless, binding on Otto. However, it did not prevent him from afterward deposing John and putting another pope in his place. I, Otto, king, cause my representative to promise and swear to you, pope John, in my name, by the Father, Son, and Holy Spirit, and by this piece of the life-giving cross and by these relics of the saints, that, if I shall come to Rome with the consent of God, I will exalt the holy Roman church and you, her ruler, to the best of my ability. And you shall never by my wish, advice, consent, or instigation, suffer any loss in life or in limb, or in the honor which you now have or which you shall have obtained from me. I will never make laws or rules in regard to the things which are under your jurisdiction or the jurisdiction of the Romans without your consent. I will restore to you all of the lands of St. Peter that shall have come into my hands; and I will cause the one to whom I shall have committed Italy to rule in my absence{67} to swear to you that he will always aid you according to his ability in defending the lands of St. Peter. {67} In accordance with imperial theory, Otto, as emperor, would rule over Italy. He agrees to protect the pope "in the things which are under his jurisdiction," but that does not mean that the pope had jurisdiction in all things. The supreme authority is the emperor, to whom the pope, as well as all other bishops and princes of Italy, are subject. 54. Otto I Confirms the Pope in the Possession of his Lands, 962. M. G. LL. 4to, IV, 1, no. 12; Altmann und Bernheim, no. 36. In order to secure his possessions, John XII persuaded Otto I to confirm his rights to them. In section 15 Otto reserves his imperial rights, thus furnishing another proof that he was sovereign over the lands which the pope held. By comparing this document with the donations of Pippin and of Karl the Great (nos. 45 and 46), the growth of the papal land claims will be apparent.