Mr. Oizumi - Ooizumi maggot

...A descendant of Muto Yorihira, a bureaucrat from the early days of the Kamakura Shogunate. In 1189 (Bun'ei 5), Yorihira's eldest son, Sukeyori, was appointed land steward of Oizumisho in Dewa Province, which was under the jurisdiction of the Chokodo Domain. His second son, Ujihira, then inherited the position, and the Oizumi clan, vassals of Dewa Province, took Oizumisho as their family name. During the Nanboku-cho period, Oizumi Nagamori built a castle at Daihoji (Daibonji, Daibonji, Daihoji) in Oizumisho, and took the name Daihoji. After that, they continued to call themselves the Oizumi clan and the Muto clan. ...

*Some of the terminology that refers to the "Oizumi clan" is listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…鎌倉幕府草創期の官僚武藤頼平の後裔。1189年(文治5)頼平の長子資頼が長講堂領出羽国大泉庄の地頭に補任，ついで次男氏平が地頭職を継承し，大泉庄を名字の地とする出羽国御家人大泉氏となり，南北朝期に大泉長盛が大泉庄大宝寺(大梵寺，大梵字，大法寺)の地に城郭を構え，大宝寺氏を称した，という。以後も大泉氏･武藤氏を併称。…

※「大泉氏」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