The archbishop of Rouen received a promise from John and from the chancellor, each supported by seven sureties, that they would keep this agreement. After it was drawn up, a postscript appears to have been added: “If any thing should be taken or intercepted by either party during the truce, it shall be lawfully restored and amends made for it. And these things are done, saving always the authority and commands of our lord the king; yet so that if the king before his return should not will this agreement to be kept, the aforesaid castles of Nottingham and Tickhill shall be given up to Lord John, whatever the king may order concerning them.” The last clause is obscure; but its meaning seems to be that if the arrangement just made should prove to be, in the judgment of the king’s ministers, untenable, it was to be treated as void, and matters were to be restored to the position in which they had been before it was made.[147] The contingency which seems to have been contemplated in this postscript very soon occurred. Some mercenaries whom the chancellor had summoned from over sea landed in England, and he at once repudiated the agreement, declaring there should be no peace till either he or John was driven out of the realm.[148] Hereupon it seems that Venneval and the Marshal, in accordance with the clause above quoted, restored the castles of Tickhill and Nottingham to John. On the other hand, an outrage on John’s part, which is recorded only as having occurred some time in this year (1191), certainly took place before October, and most likely before the middle of September. Roger de Lacy, the constable of Chester, who was responsible to Longchamp for the safe keeping of these two castles, made a vigorous effort to bring to justice the subordinate castellans to whom he had entrusted them, and who had betrayed them to John. Of these there had been two in each castle. Two managed to keep out of Lacy’s reach; the other two he caught and hanged, although one of them offered to swear with compurgators that he had never consented to the treason of his colleague, and even brought a letter from John requesting that the compurgation might be allowed--the chancellor, to whom the question had been referred, having remitted it to the decision of Lacy. While this man’s body was hanging in chains, his squire drove the birds away from it; whereupon Roger de Lacy hanged the squire. Then John took upon himself to avenge them both, not only by disseising Roger of all the lands which he held of him, but also by ravaging the lands which Roger possessed elsewhere.[149]