 The eponymous ancestor of Clan Donald is Donald, son of Reginald, son of Somerled.Somerled, son of Gillebride was 12th century leader, styled as "king of the isles" and "king of Argyll", though his origins and ancestry are obscure.The Macdonalds of Clanranald descend from Donald's son, Angus Mor and then from his son, Angus Og.