tutelary deity

noun1

1. •
   A deity, usually minor, serving as a tutelary (guardian or supporter) for a place, person, group, or activity.

   • Your son, Khyuṅ-po rDo-rje, is the son of the Medicine Buddha, and therefore he should know the Medicine Buddha as his tutelary deity and pray to him deeply, and his achievements will be great. — 1973