A certain level of reliability of the supposition is ensured by the fact that there is a description in "Eiga monogatari" (A Tale of Flowering Fortunes), Volume of Tsuki no Utage (party of the moon), saying 'in 753, TACHIBANA no Moroe the Sadaijin and others gathered to select Manyoshu poems in the era of the Empress of Koya' and that this description was included in the book-end notes of Genryaku Kohon (Genryaku Collated Text) and in the postscript of a certain old manuscript.
これは、『栄華物語』月の宴の巻に、「むかし高野の女帝の御代、天平勝宝5年には左大臣橘卿諸兄諸卿大夫等集りて万葉集をえらび給」とあり、これが元暦校本の裏書に、またある種の古写本の奥書にもはいったことが、一定の信憑性をもつものである。