Natsuno KIYOHARA, the child of Ogura O (King), who was the fourth-generation king, together with KIYOHARA no Hase, the child of Ishiura O (King), who was a younger brother of Ogura O (King), descended to the status of subject and was given the surname of KIYOHARA no Mahito.
四世王であった小倉王の子清原夏野が、小倉王の弟石浦王の子清原長谷ともども臣籍降下して清原真人の姓を賜った。