Oyacho - Ooyachi

…The city area was also the base of the Ise Taira clan, and after the downfall of the Taira clan, in 1204 (Genkyu 1), the Taira clan's supporters rose up in revolt and were pursued. Among them are Wakana Goro, who had castles in Hinaga and other places, and Shinji Saburo, who was based in Tomida. During the Nanboku-cho period, the Akabori clan of Shimotsuke Province settled in Akabori and played an active role in the area as powerful warriors. In the second half of the 15th century, their descendants, the Hamada clan and the Hazu clan, became active in controlling the shipping industry in Ise Bay as vassals of the Shugo Isshiki clan. Oyachi also had a castle for the Oyachi clan, a minor Shugodai, and the area became one of the bases for the Isshiki clan. In the 16th century, it became a place of rivalry between various forces. …

*Some of the terminology explanations that mention "Oyachi" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…また，当市域は伊勢平氏の根拠地でもあり，平氏滅亡後，1204年(元久1)平氏の与党が蜂起して追討されたが，そのなかに日永（ひなが）などに城を構えていた若菜五郎，富田（とみだ）に拠った進士三郎らの名がみえる。南北朝時代になると，下野国の赤堀氏が赤堀に土着，当地域の有力武士として活動するが，15世紀後半には，その一族の浜田氏，羽津（はづ）氏が守護一色氏の被官として伊勢湾海運支配に活発な活動をみせ，大矢知（おおやち）には小守護代大矢知氏の城もあり，当地域は一色氏の根拠地の一つとなっている。16世紀には諸勢力角逐の場となった。…

※「大矢知」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。

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