Despot

n.	1.	A master; a lord; especially, an absolute or irresponsible ruler or sovereign. Irresponsible power in human hands so naturally leads to it, that cruelty has become associated with despot and tyrant. - C. J. Smith.
	2.	One who rules regardless of a constitution or laws; a tyrant.

Noun

1.

despot - a cruel and oppressive dictator Synonyms: autocrat, tyrant

DESPOT. This word, in its most simple and original acceptation, signifies master and supreme lord; it is synonymous with monarch; but, taken in bad part, as it is usually employed, it signifies a tyrant. In some states, despot is the title given to the sovereign, as king is given in others. Encyc. Lond.

Simon Legree, absolute monarch, absolute ruler, all-powerful ruler, arrogator, autarch, autocrat, caesar, commissar, czar, dictator, disciplinarian, driver, duce, hard master, martinet, oligarch, pharaoh, slave driver, stickler, strong man, usurper, warlord