Provost

1. A person who is appointed to superintend, or preside over, something; the chief magistrate in some cities and towns; as, the provost of Edinburgh or of Glasgow, answering to the mayor of other cities; the provost of a college, answering to president; the provost or head of certain collegiate churches.
2. The keeper of a prison.
Provost marshal (often pronounced ). (a) (Mil.)
An officer appointed in every army, in the field, to secure the prisoners confined on charges of a general nature. He also performs such other duties pertaining to police and discipline as the regulations of the service or the commander's orders impose upon him.