The Nuttall Encyclopedia
A thane of the north of Scotland who, by assassination of King Duncan, became king; reigned 17 years, but his right was disputed by Malcolm, Duncan's son, and he was defeated by him and fell at Lumphanan, December 5,1056.
Wood, James, ed. Entry for 'Macbeth'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/m/macbeth.html. Frederick Warne & Co Ltd. London. 1900.