Kenneth III
Kenneth III - The son of King Duff.
History
Born in 967, the same year that his father was slain at the Battle of Gaine. He and Maol Chalvim II overthrew Constantine III at the Battle of Ratheveren in 997. Kenneth then became King of Scotland, only to be overthrown and slain by Maol Chalvim eight years later.
Real World History
Kenneth III was a real Scottish king, and believed to have been an ancestor of Gruoch, Macbeth’s wife. His history went pretty much the way as described in the entry above.