It relates the deeds of the sworn brothers Þorgeir and Þormóðr in early 11th century Iceland and abroad.
Each has a rather different version of the text: The date of composition of the lost written archetype of Fóstbrœðra saga has been the subject of considerable dispute.
These have been understood both as late interpolations and as signs of an early, developing saga style (Jónas Kristjánsson 1972).
In the words of Lee M. Hollander (1949, 75), The saga of the Sworn Brothers, Thorgeir and Thormod, occupies a position of secondary importance among the Old Icelandic family sagas—at least, it is not a favorite.
The saga is the basis for Halldór Laxness's novel Gerpla,[2] and a key source for Dauðans óvissi tími, a 2004 novel by Þráinn Bertelsson.