Tomoji Oyama

Japanese: 小山朝氏 - おやまともうじ

According to a letter of succession from Oyama Tomomasa to his eldest grandson Nagamura in 1230 (Kanki 2), the Oyama clan held the title of Gon Daisuke in Shimotsuke, and their territory extended to the area centered on the private territory of Saga no Mikuriya and the provincial office, as well as lands in Musashi, Mutsu, Owari, and Harima, the shugo province. During the Nanboku-cho civil war, Oyama Tomomasa took a neutral stance for a time due to the invasion of Kitabatake Akiie from Mutsu and the lobbying of Kitabatake Chikafusa from Hitachi, but he generally supported Ashikaga Takauji, and his younger brother Ujiyasu fought in various places with Takauji. However, in 1380-82 (Tenju 6, Koryaku 2-Kouwa 2, Eitoku 2), due to a personal fight with Utsunomiya Mototsuna, Oyama Yoshimasa rebelled against the Kamakura kubo Ashikaga Ujimitsu, and from Oyama-Joshi Castle, Gion Castle, and other castles, he fought against a large army from the Kanto region, eventually committing suicide in the mountains of Kasuo.

From Shimotsuke Province

...Former name of province. Yashu. Current Tochigi Prefecture.
[Ancient times]
Kami Province, belonging to the Tosando (Engishiki. However, when the area's abandoned fields were less than three-tenths of the land, it was treated like a large province). In the pre-Taika period, the area was roughly divided into two political and cultural regions, represented by Nasu kuni no miyatsuko and Shimokeno kuni no miyatsuko. Shimokeno, together with Kamitsukeno to the west across the Watarase River, formed a unique cultural sphere known as Kenu. After the Taika Reforms, as the establishment of districts progressed, Nasu was positioned as a district (gun) (Nasu kuni no miyatsuko monument).

*Some of the terminology used in reference to "Oyama Tomouji" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

Japanese:

…1230年(寛喜2)の小山朝政（ともまさ）から嫡孫長村への譲状によると，小山氏の所領･所職は，下野では，権大介職を持ち，重代相伝の私領である寒河御厨や国庁を中心とした地域に所領が広がり，そのほか武蔵，陸奥，尾張，守護国の播磨に所領を持っている。　南北朝内乱期には，小山朝氏は陸奥からの北畠顕家の侵攻，常陸からの北畠親房の働きかけなどがあって，一時中立的な立場をとったが，おおむね足利尊氏に属し，弟の氏政は尊氏とともに各地に転戦した。しかし，1380‐82年(天授6∥康暦2‐弘和2∥永徳2)，小山義政は宇都宮基綱との私闘が原因で，鎌倉公方足利氏満に反乱をおこし，小山鷲城，祇園城などに拠って関東の大軍を迎撃し，ついに糟尾の山中で自殺する。…

【下野国】より

…旧国名。野州。現在の栃木県。
【古代】
　東山道に属する上国(《延喜式》。ただし例損すなわち国内の荒廃田が10分の3以下のときは大国なみの扱いをうけた)。大化前代は大別すると，那須国造，下毛野国造に代表される二つの政治的･文化的地域に分かれていた。下毛野は渡良瀬川をはさんで西側の上毛野とともに毛野（けぬ）としての独自の文化圏を形成していた。大化改新以後，評（こおり）の設置が進行していく過程で那須が評(郡)として位置づけられた(那須国造碑)。…

※「小山朝氏」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

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