prefect

noun7

1. •
   The head of a department in France.
2. •
   (UK) A school pupil in a position of power over other pupils.
3. •
   The head of a county in Albania or Romania.
4. •
   The head of a prefecture in Japan.
5. •
   (historical) An official of Ancient Rome who controlled or superintended a particular command, charge, department, etc.

   • the prefect of the aqueducts; the prefect of a camp, of a fleet, of the city guard, or of provisions; the pretorian prefect, who was commander of the troops guarding the emperor's person
6. •
   A head of a dicastery of the Roman Curia of the Roman Catholic Church.
7. •
   A commander.