White horse (mythology) Poseidon was also the creator of horses, creating them out of the breaking waves when challenged to make a beautiful land animal. In Norse mythology, Odin's eight-legged horse Sleipnir, "the best horse among gods and men", is described as grey. Sleipnir is also the ancestor of another grey horse, Grani, who is owned by the hero Sigurd. In Slavic mythology, the war and fertility deity Svantovit owned an oracular white horse; the historian Saxo Grammaticus, in descriptions similar to those of Tacitus centuries before, says the priests divined the future by leading the white stallion between a series of fences
Sleipnir 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. Sleipnir is generally accepted as depicted on two 8th century Gotlandic image stones: the Tjängvide image stone and the Ardre VIII image stone. Scholarly theories have been proposed regarding Sleipnir's potential connection to shamanic practices among the Norse pagans. In modern times, Sleipnir appears in Icelandic folklore