Potentate

[L. Lat. potentatus, p. p. of potentare, to exercise power; It. potentato, Sp. potentado, Fr. potentat. See POTENT.] One who is potent; a person who possesses great power or sway; a prince; a sovereign; an emperor, king, or monarch.

Exalting him not only above earthly princes and potentates, but above the highest of the celestial hierarchy. Boyle.