off the king of Scotland against the kings of Norway and, after 1266, the king of England. There are mentions in Medieval records of fleets commanded by Scottish kings including William the Lion and Alexander II. The latter took personal command of a large naval force which sailed from the Firth of Clyde and anchored off the island of Kerrera in 1249, intended to transport his army in a campaign against the Kingdom of the Isles, but he died before the campaign could begin. Viking naval power was disrupted by conflicts between the Scandinavian kingdoms, but entered a period of resurgence in the thirteenth century when Norwegian kings began to build some of the largest ships seen in Northern European waters. These included king Hakon Hakonsson's Kristsúðin, built at Bergen from 1262-3, which was long, of 37 rooms. In 1263 Hakon responded to Alexander III's designs on the Hebrides by personally leading a major fleet of forty vessels, including Kristsúðin, to the islands, where they were swelled by local allies to as many as 200 ships. Records indicate that Alexander had several large oared ships built at Ayr, but he avoided a sea battle. Defeat on land at the Battle of Largs and winter storms forced the Norwegian fleet to return home, leaving the Scottish crown as the major power in the region and leading to the ceding of the Western Isles to Alexander in 1266. English naval power was vital to King Edward I's successful campaigns in Scotland from 1296, using largely merchant ships from England, Ireland and his allies in the Islands to transport and supply his armies. Part of the reason for Robert I's success was his ability to call on naval forces from the Islands. As a result of the expulsion of the Flemings from England in 1303, he gained the support of a major naval power in the North Sea. The development of naval power allowed Robert to successfully defeat English attempts to capture him in the Highlands and Islands and to blockade major English controlled fortresses at Perth and Stirling, the last forcing King Edward II to attempt the relief that resulted at English defeat at Bannockburn in 1314. Scottish naval forces allowed invasions of the Isle of Man in 1313 and 1317 and Ireland in 1315. They were also crucial in the blockade of Berwick, which led to its fall in 1318. After