Malcolm III (circa 1031–93), son of Duncan I, reigned 1058–93; known as Malcolm Canmore (from Gaelic Ceann-mor great head). He came to the throne after killing Macbeth in battle (1057), and helped to form Scotland into an organized kingdom.
Malcolm IV (1141–65), grandson of David I, reigned 1153–65; known as Malcolm the Maiden. His reign witnessed a progressive loss of power to Henry II of England; he died young and without an heir.
Malcolm in other Oxford dictionaries
Definition of Malcolm in the US English dictionary