constitutional monarch
A monarch whose powers are limited by a constitution. Used in political and historical contexts.
The King of the United Kingdom is a constitutional monarch.
Refers to the system of constitutional monarchy, while 立憲君主 refers to the monarch themselves.
Compound of 立憲 (constitutionalism) and 君主 (monarch). The term is a modern political concept, likely coined in the Meiji era as Japan adopted Western political systems.