 The Norse held sway in the Small Isles from 833 until the Treaty of Perth in 1266 . The <unk> clan held tutelage in the later period of Norse rule from at least 1240 , and possibly a century earlier . The only direct evidence of a Norse presence on Rùm to date is a piece of carved narwhal ivory unearthed at Bagh na h @-@ Uamh in 1940 . 
