According to "Kojiki," Oousu no mikoto, a son of Emperor Keiko, made an illicit love to Otohime, a daughter of Oone no miko, and had a son Oshigurootohiko no miko, who was the ancestor of the clan.
『古事記』によると、景行天皇の子の大碓命が大根王の娘の弟媛と密通して誕生した押黒弟日子王が祖という。