the same distinguished escort that had accompanied him to Lincoln.[487] The interview between the kings had not been of a nature to promote any real feeling of cordiality; for William had again proved from experience that the promises of John were merely empty words, whilst he had permitted his crafty rival to discover how little real importance he need attach to the threats of a Scottish war. No more dangerous knowledge could have been acquired by a prince of such a character as John, who, in his subsequent transactions with the Scottish king, turned this backwardness to his own account, evidently presuming upon the reluctance of William to venture upon the chances of a war. A rupture, however, had almost occurred through the contemplated erection of a castle at the mouth of the Tweed, for the purpose of commanding the Scottish burgh of Berwick, with its important fortress; thus endangering the prosperity of the foremost commercial town in Scotland, and neutralizing the cession of one of the keys of the Lothians, restored by the charter of Cœur de Lion. It was impossible for William to overlook so dangerous an encroachment, and whenever the English attempted to begin the building, the Scots drove them away by force, levelling their work with the ground; proceedings which were more than once repeated, until, upon his return from the disastrous campaign of 1203, John hastened to the north of England, [Sidenote: A. D. 1204.] where he was met upon the frontiers at Norham by William, who was hardly recovered from one of those dangerous attacks of illness to which his advancing years appear to have rendered him liable. The conference was stormy, and the kings parted in anger; but John was either too much occupied with the French war to add another to the list of his open enemies, or he treated the whole affair with his usual fickle levity, and in spite of the hostile character of their interview, their kingdoms remained in a state of nominal peace.[488]