In the chapter of the pledge between Amaterasu (the Sun Goddess) and Susano, Amaterasu received the sword Susano had and gave birth to Munakata Sanjojin.
アマテラスとスサノオの誓約の段で、アマテラスがスサノオの持つ剣を譲り受けて宗像三女神を生んだ。