One yen estate

…It is also called Ichien Chigyo-chi or Ichien Shoryo. Under the manor system of the ancient and medieval period, this refers to a territory or manor under the ownership of a single lord, without being under the control of other lords or provincial offices.

*Some of the terminology explanations that refer to "one yen territory" are listed below.

Source | Heibonsha World Encyclopedia 2nd Edition | Information

…一円知行地，一円所領ともいう。古代･中世の荘園制の下で，他の領主や国衙の支配をまじえず，単一の領主の領有下にある所領または荘園をいう。…

※「一円所領」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