A monarchy was a type of government with a monarch, usually a king or a queen. A monarch would usually exercise a degree of authority. Monarchies could be hereditary or elected. Monarchies varied in size and scope from small tribal groups with chieftains to planetary governments and even galaxy-spanning empires.
Most monarchical systems were limited monarchies and had powers reserved, though this was not always the case. Some monarchies were autocratic in nature, such as the Galactic Empire after the Imperial Senate was disbanded by Palpatine.