Custodian

A custodian was a job title given to somebody who held responsibility for looking after something.

Usage
One Gond custodian was charged with the maintenance of the Gond settlement's Learning Hall. (TV: The Krotons)

A selection of robot custodians were utilised in the running of the Prison. (PROSE: The Blood Cell)

Jinpar was the custodian of the Gardens of Everlasting Summer and introduced himself as such. (COMIC: The Everlasting Summer)