Odin has one eye and Sleipnir, his horse, has eight legs, which makes ten feet, three eyes and one tail.
A stranger at a Norse king’s court asks him this: “Who are the two that run on ten feet, with three eyes between them and only one tail?”
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Think of the Norse gods, and the strangest horse in their stables.
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Odin riding Sleipnir
Source: Hervarar saga ok Heiðreks, the riddles of Gestumblindi, 13th century