The Battle of Alltan-Beath also known as the Battle of Ailtan-Beath was a Scottish clan battle said to have taken place in the year 1542 in the village of Knockarthur (or Knockartel), in Sutherland, in the Scottish Highlands. It was fought between men of the Clan Mackay and Clan Sutherland.Accounts of the events and circumstances surrounding the battle vary in accounts from different historians.