According to "Nihon Shoki," Nukata no Okimi was a daughter of Kagami no Okimi who married Oama no miko (Prince Oama, later Emperor Tenmu) and gave birth to Tochi no Himemiko (also pronounced Toichi; Princess Tochi).
『日本書紀』には、鏡王（かがみのおおきみ）の娘で、大海人皇子（天武天皇）に嫁し、十市皇女を生むとある。