The name of the island may have been recorded in 1263 as 'Breiðoy' (Old Norse "broad island"). In a 1490 document the island is referred to as "Brwsøy" - "Brusi's island" which name may indicate it was the 11th century base for Earl of Orkney Brusi Sigurdsson. This possibility is supported by a later reference to his son Rögnvald as "Lord of the Shetlanders" and Thompson (2008) is in "no doubt " that Shetland specifically was in Brusi's possession during his joint earldom with his brothers.