priest-king

noun2

1. •
   A sacred king, a monarch with prominent religious attributes.

   • The while this Priest-King sacrifiz'd To's clov'n-foot God in Bethel (self-devis'd). — 1606
2. •
   A theocrat, a sovereign high priest.

   • Lower Egypt throws off the yoke of the priest-Kings of Thebes. — 1877