noun
Archaic term for a master or lord, used in historical contexts. Not used in modern Japanese outside of period pieces or historical references.
戦国時代、家臣は主公に忠誠を誓った。
In the Warring States period, retainers swore loyalty to their lord.
noun
Archaic term for the main character or protagonist in a story. Modern Japanese uses 主人公 (しゅじんこう) instead.
この物語の主公は、若い侍である。
The protagonist of this tale is a young samurai.