In the first part of "Kojiki," Tsukuyomi was born from Izanagi no mikoto as she rinsed her right eye and, together with her other children Amaterasu and Susanoo, is called Mihashira no tattokiko (the three noble children).
『古事記』上巻では、伊邪那伎命の右目を洗った際に生み成され、アマテラスやスサノオとともに「三柱の貴き子」と呼ばれる。