Parish constable
A parish constable, also known as a petty constable, was a law enforcement officer, usually unpaid and part-time, serving a parish. The position evolved from the ancient chief pledge of a tithing and takes its name from the office of constable with which it was originally unconnected.
It is distinct from the more senior position of the hundred-constable, also known as the High Constable (e.g. the High Constable of Holborn, who was one of the hundred-constables for Ossulstone; Ossulstone's hundred court was located at Red Lion Square, in Holborn).
In London (excluding the City of London), the position was superseded by the introduction of the Metropolitan Police Service in 1829, which created a full-time professional force. Elsewhere, professional county police forces took over, after the County Police Act 1839 was passed.