In Kojiki, at the creation of deities, he was born from the urine of Izanami (the Shinto goddess who gave birth to Japan), who got burnt and fell ill after giving birth to Kagutsuchi, the god of fire.
古事記では、神産みの際、火の神・カグツチ（カグツチ）を生んで火傷をし病に伏せったイザナミ（イザナミ）がしたゆまり（尿）から化生した。