In 831, advancing to the court rank of Jugoinoge, Sadanushi, in cooperation with Confucian scholars, classified ancient and modern documents compiling 1000 volumes of "Hifuryaku" (2 volumes remain in existence today) and 20 volumes of "Keikoku-shu" (an anthology of Chinese poems compiled by Imperial command).
天長8年（831年）には従五位下に進み、儒学者たちと古今の文書を分類して『秘府略』1000巻（現存2巻）を撰集し、また『経国集』20巻を撰上した。