A massacre of the Danes followed. One of the leaders of these youths was Anselan Buey OKyan or Ocahan (pronounced Okane), son of the King of Ulster, (roughly modern Northern Ireland). In 1016, as a result of this exploit, he fled Ireland and emigrated to Argyll in Western Scotland.
Once in Scotland he assisted King Malcolm II of Scotland (1005 – 1034) in several battles and was rewarded with lands in the Lennox on the eastern shores of Loch Lomond. Orignally know as the MacAusland, the clan took on the place name Buchquhanane in the mid 13th century. The Name BUCHANAN is probably derived from the Gaelic, Buchquhanane, meaning “low ground belonging to the Canon”.
In 1314 the Clan supported King Robert the Bruce at Bannockburn in Scotland’s War of Independence against England. A Charter of 1353 exists which refers to “carucate of land called Buchquhaane”. Help was given to the French King after his defeat at the Battle of Agincourt in 1415 and it is still claimed that Sir Alexander Buchanan killed the English Duke of Clarence at the Battle of Baugé in 1421. It is because of this act that the Buchanan crest shows a right hand and arm holding aloft a Ducal cap.