Potentate

[Sarah]

One who is potent; one who possesses great power or sway; aprince, sovereign, or monarch.The blessed and only potentate. 1 Tim. vi. 15.Cherub and seraph, potentates and thrones. Milton.

[Couch Potatoe]

a ruler who has a lot of power, especially one whose power is not limited, for example by the existence of a parliament

[Magaret]

A monarch or ruler, especially an autocratic one.