This work is now lost but it is believed to have been an expansion of the Latin Óláfs saga Tryggvasonar written by his monastic brother, Oddr Snorrason.
Oddr Snorrason, Latin royal biography attributed to a 12th-century Icelandic Benedictine monk at the Þingeyrar monastery (Þingeyrarklaustur)
Theodoric relied heavily on Icelandic sources, possibly including the Oldest Saga of St. Olaf and Oddr Snorrason's Óláfs saga Tryggvasonar.
His story appears in Heimskringla by Snorri Sturluson, the saga Morkinskinna, and in Óláfs saga Tryggvasonar composed by Oddr Snorrason.
Oddr Snorrason | Snorri Snorrason | Snorrason Holdings | Ólafur Páll Snorrason |
Norse sagas telling parts of the story of Augvald include the Saga of Olaf Tryggvason (by both Snorri Sturluson and Oddr Snorrason), the Saga of Half & His Heroes and the Flateyjarbok.
In the 1190s, two sagas of Olaf Tryggvason were written in Iceland, by Oddr Snorrason and Gunnlaugr Leifsson.
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.