noun
General term for a monarch or ruler of a country. In modern contexts, often refers to foreign kings or historical sovereigns.
その国の国主は、国民から敬愛されていた。
The king of that country was loved and respected by his people.
noun
daimyo ruling one or more provinces (Edo period)
Historical term for a daimyo whose domain encompassed at least one entire province during the Edo period. Not used in modern contexts.
江戸時代、国主は大名の中でも特に格式が高かった。
During the Edo period, a kokushu held particularly high status among daimyo.