Harae stems from the myth of Susano-o, the brother of the Sun goddess Amaterasu. According to the myth, while Amaterasu was supervising the weaving of the garments of the gods in the pure weaving hall, Susano-o broke through the roof and let fall a heavenly horse which had been flayed. This startled one of her attendants who, in her agitation, accidentally killed herself with the loom's shuttle.