Svadilfari

This is quite the story. I'm a little afraid to put it down, but this is history. Svadilfari was a great stallion of unusual speed and intelligence that belonged to a hrimthurs who offered to build a wall around Asgard in one winter's time in exchange for the goddess Freyja and the sun and the moon. Quite a deal, eh? Well, the gods never would have made the deal if they thought he could actually pull it off, but with Svadilfari's assistance, he was very close to finishing as winter's end drew near. So Loki disguised himself as a mare and drew Svadilfari away from his work... and then gave birth to Sleipnir, the eight-legged horse that was pride of Odin's stables.