According to "Kojiki" (The Records of Ancient Matters), the earliest ancestor was Mizuhonomawaka no Miko, a son of Hikoimasu no Miko (a prince of Emperor Kaika), and it was related to Omi no kuninomiyatsuko (Omi kokuzo).
『古事記』によると祖は日子坐王の子の水穂真若王で、淡海国造と同系。