A monarchy is a form of government in which a person, the monarch, reigns as head of state for life or until abdication. The extent of the authority of the monarch may vary from restricted and largely symbolic (constitutional monarchy), to fully autocratic (absolute monarchy), and may have representational, executive, legislative, and judicial functions.
Andor was a constitutional monarchy , although Thalisar the Last was the final empress. (DS9 novel: Andor: Paradigm)