Norikane Osaki

...The family name is said to have come from the fact that their ancestors ruled the Osaki Manor in Shimousa Province. During the Muromachi period, the family developed as the Oshu Tandai (Oshu Detective), and until the time of Osaki Norikane in the mid-15th century, they controlled the Oshu samurai, including appointing them to official positions through the shogunate. However, they later lost influence and came to be subordinated to the Date clan in southern Oshu. ...

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…苗字の由来は祖先が下総国大崎荘を領していたためという。室町時代に奥州探題として発展し，15世紀中ごろの大崎教兼のころまでは，奥州武士の官職任命を幕府に取り次ぐなど，奥州武士の統率を行っていた。しかしその後は勢力を失い，南奥の伊達氏の下風に立つようになった。…

※「大崎教兼」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