Norse Mythology: Long ago the god Loki, in the form of a white mare and impregnated by the horse Svadilfari, gave birth to Sleipnir the eight-legged. When Loki reverted to his natural form he gave Sleipnir to Odin.
Vali- Norse myth: god of retribution and son of Odin. His sole purpose of being born was to kill Hodr for his accidental murdering of their brother Baldr. He grew to adulthood in one day after his birth and killed Hodr. He survives Ragnarok