Orkneyinga saga
The original text of this Norse saga was written in the late twelfth century. It no longer exists. A new version was written in the early thirteenth century (three centuries after some of the earliest events it records) by an unknown Icelandic author who was probably associated with the cultural centre at Oddi. "Orkneyinga saga" belongs to the genre of "Kings’ Sagas" within Icelandic saga literature, a group of histories of the kings of Norway, the best known of which is "Heimskringla", written by Snorri Sturluson. Indeed Snorri used "Orkneyinga saga" as one of his sources for "Heimskringla" which was compiled around 1230 (and then "Heimskringla" became in turn a source for later versions of the "Orkneyinga saga").