Conservator /(?; 277)/

Con·ser·va·tor

Conservator

n.
  1. One who preserves from injury or violation; a protector; a preserver.
    The great Creator and Conservator of the world.
    — Derham.
  2. An officer who has charge of preserving the public peace, as a justice or sheriff. (Law)
    The lords of the secret council were likewise made conservators of the peace of the two kingdoms.
    The conservator of the estate of an idiot.
    — Bouvier.

Phrases & Compounds
Conservators of the River Thames
a board of commissioners instituted by Parliament to have the conservancy of the Thames.