Sleipnir about the god Baldr's bad dreams, Odin places a saddle on Sleipnir and the two ride to the location of Hel. The "Völuspá hin skamma" section of "Hyndluljóð" says that Loki produced "the wolf" with Angrboða, produced Sleipnir with Svaðilfari, and thirdly "one monster that was thought the most baleful, who was descended from Býleistr's brother." In the "Prose Edda" book "Gylfaginning", Sleipnir is first mentioned in chapter 15 where the enthroned figure of High says that every day the Æsir ride across the bridge Bifröst, and provides a list of the Æsir's horses. The list begins with Sleipnir: "best
Horse worship a horse, Arion, which was capable of human speech. This bears some resemblance to the Norse mythology reference to the gender-changing Loki having turned himself into a mare and given birth to Sleipnir, "the greatest of all horses". Tacitus (Germania) mentions the use of white horses for divination by the Germanic tribes: In Gallo-Roman times, the worship of Epona was widespread in the north-western portions of the Roman Empire. The Welsh legend of Rhiannon and the Irish legend of Macha, although first recorded in Christian times, may indicate memories of horse worship. The white horse of Rhiannon is another example