Chief of the clan - Uji no Osa

...the head of a clan in ancient Japan. Also called the clan leader or clan head, he participated in imperial politics on behalf of his clan, and his clan name and surname were determined by his political status. In the pre-Taika period, the head of a clan led his clan members and managed the civil and administrative departments that were subordinate to the clan, collecting taxes and duties from them, paying a portion of them to the imperial court, and also sharing official positions in the imperial court.

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

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…日本古代の氏の首長。氏長，氏宗ともいわれ，氏を代表して朝政に参与し，その政治的地位によって，氏･姓（かばね）が決定された。大化前代において，氏の首長は氏人をひきい，氏に隷属する民部･部曲（かきべ）を管理し，彼らよりミツギ(調)，エタチ(役)を徴収し，その一部を朝廷におさめ，また朝廷における官職を分掌した。…

※「氏長」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