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potentate (n.)

c. 1400, from Old French potentat and directly from Late Latin potentatus "a ruler," also "political power," from Latin potentatus "might, power, rule, dominion," from potentem (nominative potens) "powerful," from potis "powerful, able, capable; possible;" of persons, "better, preferable; chief, principal; strongest, foremost," from PIE root *poti- "powerful; lord." 

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Definitions of potentate from WordNet

potentate (n.)
a ruler who is unconstrained by law;
Synonyms: dictator
From wordnet.princeton.edu