Amenohohi was born from the magadama (a comma-shaped bead) Amaterasu was wearing around her right mizura hair when Amaterasu and Susanoo made the oath of Amaterasu and Susanoo.
アマテラスとスサノオがアマテラスとスサノオの誓約をしたときに、アマテラスの右のみずらに巻いた勾玉から成った。