autocrat \AW-tuh-krat\ (noun) - An absolute monarch who rules with unlimited authority; by extension, any person with undisputed authority in a relationship or situation.
"Whenever the Autocrat felt the need of money, he sent his tax-gatherers far and wide, and people who up to that time had no idea of such a thing found that they lived in the territory of Mutjado." -- Frank Richard Stockton, 'The Battle of the Third Cousins'
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Autocrat is from Greek autokrates, "ruling by oneself," from auto-, "self" + -krates, "ruling," from kratos, "strength, power, rule, dominion."