Around this time, in the Kanto region, TAIRA no Masakado, who was an Imperial descendant of Emperor Kanmu for five generations, suppressed the internal conflicts between his relatives, and when he intervened in disputes amongst the neighboring provinces, he opposed the local Kokushi (provincial governor), soon caused insurrection and called himself 'Shinno' (new Emperor), banished Kokushi appointed by the Imperial Court, and appointed his Kokushi to 7 provinces in Kanto and Izu region.
このころ、関東では桓武天皇5代の皇胤平将門が親族間の内紛を抑え、近隣諸国の紛争に介入したところ、在地の国司と対立、やがて叛乱を起こして自ら「新皇」（新天皇）と名乗り、朝廷の任命した国司を追放し、関東7ヶ国と伊豆国に自分の国司を任命した。