A monarchy is a country that is ruled by a monarch, and monarchy is this system or form of government.
A monarch, such as a king or queen, rules a kingdom or empire. In a constitutional monarchy, the monarch's power is limited by a constitution. But in an absolute monarchy, the monarch has unlimited power. Monarchy is an old form of government, and the word has been around a long time. It derives from Greek monarkhiā, from monarkhos "monarch."