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PERSON
Taira no Masakado
Taira no Masakado
New Emperor (Shinkō)
?-940 · 享年 37歳
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系
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生
生涯
A warrior of the mid-Heian period, a great-great-grandson of Emperor Kanmu and a powerful chieftain of the Kantō region. He built his power base in the Bandō area. In 939, he seized successive provincial headquarters in Hitachi, Shimotsuke, and Kōzuke (the Jōhei-Tengyō Rebellion) and proclaimed himself "New Emperor," declaring an independent regime in the east. The court was stunned and dispatched Fujiwara no Hidesato and Taira no Sadamori to suppress him. He was killed in battle in 940 near Sarushima in Shimotsuke Province (present-day Bandō City, Ibaraki), and his severed head was sent to the capital. Though the rebellion was short-lived, it stands as a defining historical event symbolizing the rise of eastern warrior bands and the limits of court authority in the provinces. His burial mound remains in Ōtemachi, Tokyo, revered as a powerful spiritual site.
人
Personality
A bold, magnanimous warrior of the east, prizing martial honor over court authority. He was viewed as a hero by the people of Bandō. Yet behind his fierce drive lay a tendency to misread the larger political situation around him.
義
Historical Significance
As a pioneer who attempted to establish Japan's first warrior-led government, he influenced later figures such as Minamoto no Yoritomo and Ashikaga Takauji. His burial mound in Ōtemachi still draws devotees today, and legends of his vengeful spirit remain deeply embedded in the culture.
話
Famous Anecdotes
其 一
Legend of Masakado's Head
His severed head displayed in Kyoto reportedly opened its eyes after three days and flew east seeking its body. The spot where it fell became the cursed Masakado mound in Otemachi.
Taira no Masakado Timeline
903
Taira no Masakado born in Kanto (estimated)
935
Clan conflicts intensify. Kills uncle Taira no Kunika
937
Expands power in Hitachi and Shimosa
939
Conquers provincial capitals of Hitachi, Shimotsuke, and Kozuke. Declares himself "New Emperor"
940
Defeated by Taira no Sadamori and Fujiwara no Hidesato. Killed in battle (est. age 37)
事
Related Historical Events
935
Jōhei-Tengyō Rebellions
Between 935 and 941, two major rebellions erupted almost simultaneously against the imperial court — Taira no Masakado in the east and Fujiwara no Sumitomo in the west. Masakado, a warrior of the Kanmu-Heishi line, turned a clan feud into rebellion across the Kantō region. In 939 he attacked the provincial headquarters of Hitachi, Shimotsuke, and Kōzuke and proclaimed himself "Shinnō" (New Emperor), founding an independent Kantō regime. In 940 he was defeated and killed by Fujiwara no Hidesato and Taira no Sadamori. Meanwhile, Sumitomo led Seto Inland Sea pirates in raids on Iyo, Sanuki, and Dazaifu, dominating western Japan until his suppression in 941 by Ono no Yoshifuru and Minamoto no Tsunemoto. The twin rebellions exposed the limits of the ritsuryō state's military and announced the arrival of provincial warrior bands — a decisive turning point that put samurai on the historical stage.
地
Related Places — 3
史
Masakado's Mound
東京都
Killed February 14, 940, in Shimosa Province by the allied forces of Fujiwara no Hidesato and Taira no Sadamori. He had proclaimed himself "New Emperor" and established an independent regime in the Kanto region, but was suppressed within two months. Legend says his severed head, displayed in Kyoto, opened its eyes after three days and flew eastward seeking its body. This mound marks where it fell. Attempts to move or demolish the site have allegedly triggered curses—incidents were reported after the Great Kanto Earthquake and when GHQ planned its removal.
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神
Karasumori Shrine
東京都
Karasumori was founded as, in effect, a monument to Masakado's defeat — commemorating the dream of a white fox bearing a white-feathered arrow that was granted to Fujiwara no Hidesato when he prayed in this Musashi forest before suppressing the Masakado Rebellion of 939–940. Where the Masakado Grave in Otemachi is a shrine pacifying his vengeful spirit, Karasumori stands as its counterpart — the victory shrine of the side that defeated him. Visiting both yields a fuller picture of the rebellion that shook the mid-Heian Kanto.
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神
Yoroi Shrine
東京都
Yoroi Shrine is said to mark the spot where Masakado's armor was buried, and Masakado is enshrined as one of its four deities. While the Masakado grave mound in Ōtemachi is feared as a 'place of curses,' Yoroi Shrine represents a gentler tradition: pacifying the vengeful spirit by enshrining the armor. Masakado is revered as a hero who sought Kantō independence, yet his ghost is counted among Japan's three most fearsome. The shrine stands as the Kita-Shinjuku nexus of this dual cult of hero and wraith.
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