It is said that he conducted his own investigation into who was behind the Toi invasion (the invasion of northern Kyushu by Jurchen pirates) and the whereabouts of the Japanese captives that were kidnapped and put aboard Toi ships, after which he reported his findings to the Dazai-fu (local government office in Kyushu region).
刀伊の入寇の正体と、その賊船に連れ去られた日本人捕虜の消息を独自に調査し、大宰府に報告したとされる。