The historian Hisashi HOSHINO in the Meiji period stated this theory, which was supported by descriptions between 1897 and 1906 in the family document of the Tanaka family, who were Shinto priests of Iwashimizu Hachiman-gu Shrine, that the Imperial instruction of 1046, which was dedicated to the Mausoleum of Emperor Ojin by MINAMOTO no Yorinobu, explicitly described that: 'the ancestors are Shinbochi, Tsunemoto, Imperial Prince Motohira, Emperor Yozei, and Emperor Seiwa, from newest to oldest.'
これは明治の歴史学者星野恒の唱えたもので、明治30年代に石清水八幡宮祠官田中家文書の中に源頼信が応神天皇陵に納めたとされる永承元年（1046年）告文に「先人新発其先経基其先元平親王其先陽成天皇其先清和天皇」と明記してある事を根拠としたもの。