 One latin version of the "Óláfs saga Tryggvasonar" is attributed to Oddr - the original work has been almost completely lost but a translation into Old Norse is preserved in two nearly complete versions and a fragment of a third.Oddr made use of previous written works including those of Sæmundr fróði and Ari Þorgilsson as well as "Acta sanctorum in Selio" and possibly "Historia de Antiquitate Regum Norwagiensium".In turn Snorri Sturluson made use of Oddr's work when writing the "Heimskringla", as did the author of "Óláfs saga Tryggvasonar en mesta".