Hermóðr
Hermodr (Old Norse: Hermóðr - “Spirit of War”) is the messenger of the gods in Norse mythology, and is the fastest among the Æsir. When Baldr died, Hermóðr volunteered to go to Niflheimr to ask Hel to release Odin's beloved son. Hermóðr was said to have galloped on the horse Sleipnir for nine days and nine nights.