The Taira no Masakado Rebellion

Japanese: 平将門の乱 - たいらのまさかどのらん

This was a rebellion that occurred in the Kanto region in the 10th century. Along with the rebellion of Fujiwara no Sumitomo that occurred at the same time in the Western Sea, it is also known as the "Johei-Tengyo Rebellion" or "Tengyo Rebellion." Masakado, whose base was in northern Shimousa, had been engaged in repeated battles since 935 (Johei 5) with his clan members Taira no Kuniyoshi, Taira no Sadamori, Yoshikane, and Yoshimasa, who had mansions in western Hitachi. In November 939 (Tenkei 2), he plundered and burned down the Hitachi provincial government office and captured the provincial governor Fujiwara no Yasukazu and others. There are two theories about the direct cause of this: one is that the army clashed with the government in order to rescue Fujiwara no Genmei, who had fled Hitachi to Shimousa relying on Masakado, and the other is that Yasukazu's son Tamenori allied with Masakado's sworn enemy Sadamori and provoked Masakado. Both theories are based on Masamune's Chronicle 》it looks like.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

10世紀に関東で起きた反乱事件。同時に西海で起こった藤原純友の反乱とともに〈承平･天慶の乱〉，あるいは〈天慶の乱〉ともいう。下総北部を地盤としていた将門は，935年(承平5)以来，常陸西部に館をもつ一族の平国香，平貞盛，良兼，良正らと合戦を繰り返していたが，939年(天慶2)11月に常陸国衙を略奪して焼き払い，国守藤原維幾らを捕らえた。この直接の原因としては，将門を頼って常陸から下総にのがれた藤原玄明を助けるため国軍と衝突することになったとする説と，国守維幾の子為憲が将門の仇敵貞盛と結んで将門を挑発したことに中心をおく説とが，ともに《将門記》にみえる。

出典　株式会社平凡社世界大百科事典第２版について　情報

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