In the spring of 815, he sent Koshu, his discipline, to powerful priests in the eastern region, such as Tokuichi Bosatsu in Aizu Province, and Kochi zenji and Mantoku (萬徳) Bosatsu (it may have been Kitoku) to request copying the scriptures of Esoteric Buddhism.
弘仁6年（815年）春、会津の徳一菩薩、下野の広智禅師、萬徳菩薩（基徳の誤記か?）などの東国有力僧侶の元へ弟子康守らを派遣し密教経典の書写を依頼した。