Hversu Noregr byggðist is an account of the origin of various legendary Norwegian lineages, which survives only in the Flateyjarbók. It traces the descendants of the primeval Fornjót, a king of "Gotland, Kænland and Finnland", down to Nór, who is here the eponym and first great king of Norway, and then gives details of the descendants of Nór in a following section known as the Ættartölur, 'Genealogies'.