Masakado then conquered Kanto and tried to establish an independent state, calling himself Shinno (New Emperor), but, only two months later, he was attacked and killed by an army headed by TAIRA no Sadamori and FUJIWARA no Hidesato.
将門は関東を制圧して新皇と自称し関東に独立勢力圏を打ち立てようとするが、平貞盛、藤原秀郷ら追討軍の攻撃を受けて、新皇僭称後わずか2ヶ月で滅ぼされた。