Twelve Years' War in Oshu - Oshu Jyuunienkassen

...A war fought between Minamoto no Yoriyoshi, the governor of Mutsu and the Shogun of the Chinjufu, and the Abe clan of Mutsu Province from 1056 (Tenki 4) to 62 (Kohira 5). In the past, the 12 years from 1051 (Eisho 6) when Minamoto no Yoriyoshi became the governor of Mutsu to 62 were considered to be a period of war, and were called the Twelve Years of War in Oshu. Abe no Yoriyoshi was the head of the fushiyu (subjugated Emishi) that had been his ancestors', and the governor of the six Oku districts (Izawa, Esashi, Waga, Hienuki, Shiba, and Iwate), but he was rebellious against the provincial governor from early on, and was said to be "ramming through the six districts and plundering the people." ...

*Some of the terminology used in reference to the "Oshu Twelve Year War" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…1056年(天喜4)から62年(康平5)まで，陸奥守兼鎮守府将軍源頼義と陸奥国の安倍氏の一族との間で戦われた戦乱。古くは源頼義が陸奥守になった1051年(永承6)から62年までの12年間を乱の期間と見て，奥州十二年合戦といわれていた。安倍頼良は先祖以来の俘囚（ふしゆう）(服属した蝦夷（えみし）)の長で，奥六郡(伊沢，江刺，和賀，稗貫，斯波，岩手の6郡)の司であったが，早くから国司に反抗的で，〈六郡を横行し，人民を劫略（ごうりやく）す〉といわれていた。…

※「奥州十二年合戦」について言及している用語解説の一部を掲載しています。

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