Even after the settlement arrived at on Friday, some minor points of dispute remained. The barons refused to be satisfied without substantial security that the reforms and restorations agreed on would be carried out by the King; they demanded that both the city of London and the Tower of London should be left completely under their control as pledges of John’s good faith, until 15th August, or longer, if the reforms had not then been completed. John obtained a slight modification of these demands; he surrendered the city of London to his opponents, as they asked; but placed the Tower in the neutral custody of the Archbishop of Canterbury. These conditions were embodied in a supplementary treaty, which describes itself as _Conventio facta inter Regem Angliae et barones ejusdem regni_.[50] If the barons distrusted John, he was equally distrustful of them, demanding the security they had promised for fulfilment of their part of the original compact. He now asked a formal charter in his favour that they would observe the peace and their oaths of homage, which they point-blank refused to grant. The King appealed to the prelates without effect. The archbishops, with several suffragans, however, put a formal protest on record of the barons’ promise and subsequent refusal to keep it.[51] ----- Footnote 50: _New Rymer_, I. 133. See Appendix. It is undated, but must be later than the letters to sheriffs concerning election of twelve knights, to which it alludes. Footnote 51: _Rot. Pat._, p. 181. As we have to depend for our knowledge of this important protest on one copy, engrossed on the back of a membrane of an official roll (No. 18 of John’s 17th year), it is possible to doubt its genuineness; but it is unlikely to be purely a forgery. ----- The two archbishops and their brother prelates entered a second protest of a different nature. They seem to have become alarmed by the drastic measures adopted or likely to be adopted, founded on the verdicts of the twelve knights elected in each county to carry into effect the various clauses of the Great Charter directed against abuses of the Forest laws. Apparently, it was feared that reforms of a sweeping nature would result, and practically abolish the royal forests altogether. Accordingly, they placed their protest formally on record—acting undoubtedly in the interests of the Crown, feeling that as mediators they were bound in some measure to see fairplay. They objected to a strained construction of the words of the Charter, holding that the articles in question ought to be understood as limited; all customs necessary for the preservation of the forests should remain in force.[52] ----- Footnote 52: See _Rot. Pat._ and _New Rymer_, I. 134. -----