According to the "Taiheiki" (The Record of the Great Peace), he supposedly stopped the deciphering of the imperial command of Emperor Godaigo sent to Kamakura during Shochu Disturbance when the subjugation plan of Emperor Godaigo against the bakufu (Japanese feudal government headed by a shogun) was revealed in 1324.
正中(日本)元年（1324年）、後醍醐天皇の倒幕計画が露見した正中の変において、『太平記』に拠れば鎌倉へ送られた後醍醐天皇誓書の判読を止めたという。