Mr. Kokubu

Japanese: 国分氏 - こくぶうじ

A powerful clan in Shimousa in the Middle Ages. A Taira clan of the Chiba clan. One of the Six Chiba clans. It began when Chiba Tsunetane's fifth son, Tanemichi, was given Kokubu-go in Katsushika County. Tanemichi also lived in Motoyahagi Castle in Katori County, and was granted lands in Oshu, Totomi, and Mikawa. According to the Azuma Kagami, in 1180 (Jisho 4), Tanemichi and his family met Minamoto no Yoritomo at the Shimousa provincial capital, and in 1182 (Juei 1), he brought a bow and arrow to celebrate the birth of Yoriie. In 1184 (Genryaku 1), he participated in the Battle of Ichinotani, and in 1189 (Bun'ei 5), he also served in the Oshu Conquest. The main Chiba family declined during the Nanboku-cho and Muromachi periods, but Tanemichi's descendants continued to operate, using Motoyahagi and Osaki castles as their bases and possessing Otosho (present-day Sawara City).

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

中世下総の豪族。平姓千葉氏族。千葉六党の一つ。千葉常胤の五男胤道が葛飾郡国分郷を与えられたのに始まる。胤道はまた香取郡本矢作城に住み，奥州をはじめ遠江，三河にも加恩の地を得た。《吾妻鏡》によれば，1180年(治承4)胤道は一門とともに下総国府で源頼朝にあい，82年(寿永1)頼家誕生祝儀に弓箭をもった。84年(元暦1)一ノ谷の戦に参加，89年(文治5)奥州征伐にも従軍している。南北朝･室町時代に千葉宗家は衰えたが，胤道の子孫は本矢作，大崎2城を本拠として大戸庄(現，佐原市)を領有して活動した。

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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