In addition, the Dainagon (Major Counselor), Mitsuhiro KARASUMA, visited Edo as Imperial envoy during the era of Iemitsu TOKUGAWA, the third Seii taishogun (literally, "great general who subdues the barbarians") of the Edo Shogunate, to hear of Masakado's achievements from the Shogunate, upon which he cleared Masakado tarnished reputation as an enemy of the Imperial Court, reporting the Emperor in proclaiming, "Masakado is not an enemy of the Imperial Court" during the era of Iemitsu.
また、将門の朝敵としての汚名は江戸幕府三代征夷大将軍徳川家光の時代に、勅使として江戸に下向した大納言烏丸光広が幕府より将門の事績について聞かされ、「将門は朝敵に非ず」との奏上により、除かれている。