From the period of the Ritsuryo codes to the period of regency, and government by cloistered emperors, these documents were used as official documents and were called kushikiyo-monjo (documents prescribed in the Kushiki-ryo [law on state documentary forms in the Yoro Code]).
律令期から摂関政治、院政期までは公式文書としてこれらの文書が使われ公式様文書と呼ばれていた。