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 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.
A state ruled by a prince; a principality.
The office of one who is principal or preeminent (such as a prince); the quality or status of being principal; preeminence.
The early period of the Roman Empire, during which some characteristics of the government of the Roman Republic were retained; the reign of any particular emperor during said period.
Primary; principal.