The certifications sent by Prince Okiyo, Masakado and Takeshiba dated May 2, 939, dispelled the court's doubts because the provincial office of five provinces--Hitachi, Shimofusa, Shimotsuke, Musashi and Kozuke--suggested in the certification that the rumor of a planned rebellion was groundless.
興世王、将門、武芝は承平9年5月2日付けで常陸・下総・下野・武蔵・上野5カ国の国府の「謀反は事実無根」との証明書をそえて送ると朝廷は疑いを解いた。