the name of four kings of Scotland. Malcolm I (died 954), reigned 943–954. Malcolm II (circa 954–1034), reigned 1005–34. 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 was responsible for helping 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.