Constable
From BiblePortal Wikipedia
Webster's Dictionary [1]
(1): (n.) An officer of the peace having power as a conservator of the public peace, and bound to execute the warrants of judicial officers.
(2): (n.) A high officer in the monarchical establishments of the Middle Ages.
The Nuttall Encyclopedia [2]
A high officer of State in the Roman empire, in France, and in England, charged at one time with military, judicial, and regulative functions.