During the Otenmon Incident in 866, after receiving a complaint from TOMO no Yoshio, he ordered the arrest of Sadaijin (Minister of the Left) MINAMOTO no Makoto (a court noble).
866年（貞観8年）の応天門の変に際し、伴善男の告発を受け一旦は左大臣源信(公卿)の逮捕命令を下す。