 Composed around 1300 it takes "Óláfs saga Tryggvasonar" in Snorri Sturluson's "Heimskringla" as its base but expands the narrative greatly with content from the previous biographies of the king by Oddr Snorrason and Gunnlaugr Leifsson as well as less directly related material.The saga is preserved in a number of manuscripts which can be divided into two groups; an earlier redaction preserved in the manuscripts "AM 53 fol.