In Kojiki, it is written that he was the first boy (the second boy in an Arufumi [supplement volumes of explanatory notes in Nihonshoki] of Nihonshoki) of five princes who were born when Susanoo (a deity in Japanese mythology) was given a magadama (comma-shaped bead) by Amaterasu (the sun goddess) during their ukei (pledge).
古事記では、アマテラスとスサノオとの誓約の際、スサノオがアマテラスの勾玉を譲り受けて生まれた五皇子の長男（日本書紀の一書では次男）であるとしている。