conservator

Short definition from Wiktionary

Noun

1. 1
   One who conserves, preserves or protects something.
2. 2
   A person appointed by a court to manage the affairs of another; similar to a guardian but with some powers of a trustee.
3. 3
   An officer in charge of preserving the public peace, such as a justice or sheriff.
4. 4
   A judge delegated by the pope to defend certain privileged classes of persons from manifest or notorious injury or violence, without recourse to a judicial process.
5. 5
   A professional who works on the conservation and restoration of objects, particularly artistic objects.