Eirik the Red's Saga

[Olaf, who was called Olaf the White, was styled a warrior king. He was the son of King Ingjald, the son of Helgi, the son of Olaf, the son of Gudred, the son of Halfdan Whiteleg, king of the Uplands (in Norway). He led a harrying expedition of sea-rovers into the west, and conquered Dublin, in Ireland, and Dublinshire, over which he made himself king.