Claim: Sleipnir appears nowhere.
Evidence: Additionally , Sleipnir is mentioned in a riddle found in the 13th century legendary saga Hervarar saga ok Heiðreks , in the 13th century legendary saga Völsunga saga as the ancestor of the horse Grani , and book I of Gesta Danorum , written in the 12th century by Saxo Grammaticus , contains an episode considered by many scholars to involve Sleipnir.