A general problem with the Nordic mythology is the lack of written and reliable sources. Scandinavia is an area with huge impact of geological transformations with lead to many changes in settlement structure. The artefact of Tundholm is one of the strongest evidences for the mythology of Skinfaxi. In the Codex Regius, Skinfaxi and Hrimfaxi are mentioned in the Vafþrúðnismál during the battle of wits between Odin and Vafþrúðnir (the jotun). This is the oldest manuscript that has these two horses mentioned in verses 7 and 8.