Monarchy

Noun

1. 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).

   "An absolute monarchy is a monarchy where the monarch is legally the ultimate authority in all temporal matters."

2. The territory ruled over by a monarch; a kingdom.
3. 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.
4. States based on a system of governance headed by a king or a queen.