noun
lord of a castle; castle lord
Historical term for the feudal lord who owned and ruled a castle. Still used in historical contexts and for modern castle owners or managers.
この城の城主は戦国時代の大名だった。
The lord of this castle was a daimyo in the Warring States period.
城主の家系は代々この地を治めてきた。
The castle lord's family has ruled this land for generations.