Masamitsu Koyama

Japanese: 小山政光 - おやま・まさみつ

Year of birth: Year of birth and death unknown. A military commander in the late Heian and early Kamakura periods. He was the son of Ota Masayoshi, a descendant of Fujiwara no Hidesato, and was called Shiro. He owned Saga Mikuriya (Oyama Manor) in Shimotsuke Province (Tochigi Prefecture), and exerted his influence as the Shimotsuke Daijo. He was in Kyoto during the Jisho-Juei Civil War, but while he was away in 1183, his wife (Minamoto no Yoritomo's wet nurse) and son Tomomasa joined Yoritomo and defeated Shida Yoshihiro of Hitachi (Ibaraki Prefecture), who was on the anti-Yoritomo side, in the Battle of Nogimiya in Shimotsuke. During Yoritomo's Battle of Oshu in 1189, he met with Yoritomo at the camp in Utsunomiya, where he spoke highly of the military exploits of the Oyama clan. His three sons Tomomasa (Oyama), Munemasa (Naganuma), and Tomomitsu (Yuki) became powerful vassals of the shogunate. <References> “Oyama City History” Comprehensive History Edition I, edited by Oyama City

(Minegishi Sumio)

Source: Asahi Japanese Historical Biography: Asahi Shimbun Publications Inc. About Asahi Japanese Historical Biography

Japanese:

生年：生没年不詳
平安末・鎌倉初期の武将。藤原秀郷子孫の大田行政の子,四郎を称す。下野国(栃木県)寒河御厨(小山荘)を領有し,下野大掾として勢力を張る。治承・寿永内乱期には在京していたが,留守中寿永2(1183)年に妻(源頼朝の乳母)と子の朝政が,頼朝に属して下野の野木宮合戦で反頼朝方の常陸(茨城県)の志田義広を撃破した。文治5(1189)年の頼朝の奥州合戦の際には,宇都宮の陣所で頼朝に謁し,小山氏の武功を述べ立てている。子息の朝政(小山),宗政(長沼),朝光(結城)の3兄弟は幕府の有力御家人となった。<参考文献>小山市編『小山市史』通史編Ⅰ

(峰岸純夫)

出典　朝日日本歴史人物事典：（株）朝日新聞出版朝日日本歴史人物事典について　情報

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