Another word for potentate

Valdemar was now, after the king of England, the most powerful potentate in the north of Europe.

The flight of the tsarevich to a foreign potentate was a reproach and a scandal.

The last of the native princes who had real authority was a potentate known as Dom Pedro V.

Each petty potentate strove for his own private advantage in the confusion; and at this epoch the chief gains accrued to the papacy.

Nearly a quarter of a century later Prester John appears upon the scene, in the character of a Christian conqueror and potentate who combined the characters of priest and king, and ruled over vast dominions in the Far East.