The Kingdom of the Isles was a Norse-Gaelic kingdom comprising the Isle of Man, the Hebrides and the islands of the Clyde from the 9th to the 13th centuries AD. The islands were known to the Norsemen as the Suðreyjar, or "Southern Isles" as distinct from the Norðreyjar or Northern Isles of Orkney and Shetland. In Scottish Gaelic, the kingdom is known as Rìoghachd nan Eilean. The territory is sometimes called the Kingdom of Mann and the Isles, although only some of the later rulers claimed that title. The historical record is incomplete, and the kingdom was not a continuous entity throughout the entire period. At times the rulers were independent of external control, although for much of the period they had overlords in Norway, Ireland, England, Scotland or Orkney. At times there also appear to have been competing claims for all or parts of the territory. The islands have a total land area of over 8,300 square kilometres (3,205 sq mi) and extend for more than 500 kilometres (310 mi) from north to south.
Signature page from the Annals of the Four Masters
Folio 32v of the Book of Kells which may have been produced by the monks of Iona and taken to Ireland for safekeeping after repeated Viking raids of the Hebrides.
Modern Dumbarton Castle, the site of the 9th-century siege by the Uí Ímair
A posthumous "Sihtric" coin from the British Museum, minted at Dublin c. 1050
The Norse–Gaels were a people of mixed Gaelic and Norse ancestry and culture. They emerged in the Viking Age, when Vikings who settled in Ireland and in Scotland became Gaelicised and intermarried with Gaels. The Norse–Gaels dominated much of the Irish Sea and Scottish Sea regions from the 9th to 12th centuries. They founded the Kingdom of the Isles, the Kingdom of Dublin, the Lordship of Galloway, and briefly ruled the Kingdom of York. The most powerful Norse–Gaelic dynasty were the Uí Ímair or House of Ivar.
Skuldelev II, a Viking warship built in the Norse–Gaelic community of Dublin (c. 1042)
R. R. McIan's impression of a Norse–Gaelic ruler of Clan MacDonald, Lord of the Isles