Buchan having acquired vast territories in the north lost a large part of them during his own lifetime (lands of Ross and Urquhart). He held royal appointments only to have them removed (Justiciar of Scotia and Royal Lieutenant north of the Moray Firth.) He was unsuccessful in maintaining law and order and this seen alongside his inability to hold onto his Ross territories demonstrated his ineffectiveness. He died in 1405, and was buried at Cathedral of Dunkeld, Perthshire. His chest tomb, topped by an effigy in armour, is one of the few Scottish royal monuments to have survived from the Middle Ages.