5. In consideration of these concessions, we have taken the oath of fidelity to you and to your successors and to the Roman church, and the oath of liege homage to you. Two copies of this oath have been made, one of which has been signed and sealed by us and given into your keeping, and the other sealed by you and given to us. We agree also to pay an annual tribute of 600 "schifates" for Apulia and Calabria, and 500 from Marsia.... You agree to grant all these things also to our heirs and successors, on condition that they do homage to you and your successors, and keep the promises which we have made to you.... 100-102. The Besançon Episode, 1157. 100. Letter of Adrian IV To Frederick, September 20, 1157. Ragewin, Gesta Friderici, III, ch. 9; M. G. SS. folio, XX; Doeberl, IV, no. 35a. Frederick I had been deeply offended by the treaty which Adrian IV made with William of Sicily (no. 99), because it had been made without his consent, and without in any way considering the claims which the emperor laid to Sicily. In making the treaty of Constance (no. 97) Frederick had undoubtedly been outwitted by the papal diplomacy. He had been led to promise not to make peace with the Normans without the consent of the pope. He apparently took it for granted that the pope was bound in the same way not to make peace with the Normans without the imperial consent, although it was not stipulated in the agreement. While Frederick had promised certain definite things, the pope's promise was couched in general terms. He had promised to "aid the king in maintaining and increasing the honor of his realm as his office demands. If anyone attacks the honor or the authority of the king, the pope will warn him to make satisfaction," etc. The pope denied that William of Sicily was "attacking the honor or authority of the king" because the lands which William held did not belong to Frederick; they were the property of the pope himself, and therefore he might make terms with William without consulting Frederick. Frederick complained that the pope had acted in bad faith in making peace with William, and that he had broken the treaty of Constance. The pope, however, maintained that he had in no way infringed the treaty, and that Frederick had no grounds for complaint. This is the general background for the Besançon episode, the chief features of which will be clear from the following documents.