In 1411 the Clan Matheson fought for Domhnall of Islay, Lord of the Isles at the Battle of Harlaw where the clan chief, Alasdair was captured. The Clan Matheson was then said to have numbered over two thousand warriors. "Macmaken" supported Alexander of Islay, Earl of Ross who was suspected of treason by James I of Scotland. As a result, the earl was seized by the king at Inverness in 1427. Matheson was also arrested by the king, and was executed.