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.
General Sir Richard Dannatt, dressed in the formal attire of the Constable of the Tower, speaking at the Ceremony of the Constable's Dues, June 2010