Government in medieval monarchies generally comprised the king's companions, later becoming the royal household, from which the officers of state arose, initially having household and government duties. Later some of these officers became two: one serving state and one serving household. They were superseded by new officers, or were absorbed by existing officers. Many of the officers became hereditary and thus removed from practical operation of either the state or the household.

A constable is a person holding a particular office, most commonly in criminal law enforcement. The office of constable can vary significantly in different jurisdictions. A constable is commonly the rank of an officer within the police. Other people may be granted powers of a constable without holding this title.