"Fair Leather" from the type of parchment) is one of the kings' sagas, written around 1220.
It is assumed to be a source for what is known as the Heimskringla, containing histories of Norwegian kings from the 9th to 12th centuries, as well as skaldic verse.
An immediate source for the Heimskringla of Snorri Sturluson, Fagrskinna is a central text in the genre of kings' sagas.
It contains a vernacular history of Norway from the ninth to the twelfth centuries, from the career of Halfdan the Black to the Battle of Re in 1177, and includes extensive citation of skaldic verses, some of them preserved nowhere else.
Apart from making use of skaldic poetry and oral tradition, the author drew extensively on written texts of the kings' sagas.