A form of government where sovereignty is embodied by a single ruler in a state and his high aristocracy representing their separate divided lands within the state and their low aristocracy representing their separate divided fiefs.
The territory ruled over by a monarch; a kingdom.
A government in which sovereignty is embodied within a single, today usually hereditary head of state (whether as a figurehead or as a powerful ruler).
States based on a system of governance headed by a king or a queen.
A group of twenty people, especially (politics) a council of twenty men sharing an office or rule and particularly (historical) such an administrative council in ancient Rome.