English: Scottish king, chiefly remembered for ending the Norse threat from the western isles by defeating an invasion force led by the Norwegian king, Haakon IV, at the battle of Largs in 1263. The victory was as much due to a storm that wrecked the Norse fleet, sheltering at Lamlash on the Isle of Arran, as the small military engagement that followed on-shore. By the Treaty of Perth (1266) the Scottish kingdom acquired the Isle of Man and the Hebrides; and peace was further cemented in 1281 by the marriage of Alexander's daughter, Margaret, to Norway's King Eric II.