In the 13th century, Scotland was divided between the Scots on the mainland and the Vikings of the western islands. The struggle that followed brought an end to Viking rule in the country. A new BBC Two program looks at The Last Battle of the Vikings.
"It was a war just waiting to happen," says underwater archaeologist Dr Jon Henderson, about the divisions in the country, led in the 13th century by Haakon IV of Norway and Alexander II of Scotland. The result was the Battle of Largs which took place in October 1263.