potentate

A powerful leader; a monarch; a ruler.

But Kings and mightieſt Potentates muſt die, For that's the end of humane miſerie.

She was now one of a group of oriental beauties who, in the second act of the comic opera, were paraded by the vizier before the new potentate as the treasures of his harem.

A powerful polity or institution.

A self-important person.

Someone acting in an important role.

"Those foreigners," thought the female potentate of the Sun, "won't know what to order; but I'll show them what a good supper is."

Regnant, powerful, dominant.