The Scandinavian Earls of Orkney trace their descent from the noblest and most heroic of the ruling dynasties of the north. Ivar, Prince of the Uplands in Norway, who claimed a descent from the deified hero Thor, was father of Eystein. [Sir Bernard Burke, Dormant, Abeyant, Forfeited, and Extinct Peerages, Burke's Peerage, Ltd., London, 1883, p. 492, Sinclair, Earl of Orkney]