Kenneth began his reign by ravaging the Britons, probably as an act ofvengeance, but his name is also included among a group of northern andwestern kings said to have made submission to the Anglo-Saxon king Edgarin 973, perhaps at Chester; and the chronicler Roger of Wendover (FloresHistoriarum, under the year 975) states that shortly afterward Kennethreceived from Edgar all the land called Lothian (i.e., between the Tweedand the Forth rivers). This is the first mention of the River Tweed asthe recognized border between England and Scotland. Kenneth was slain,apparently by his own subjects, at Fettercairn in the Mearns.