potentate
noun /ˈpəʊtnteɪt/
/ˈpəʊtnteɪt/
(literary, often disapproving)- a political leader who has a lot of power, especially when this is not limited by a parliament, etc.Word Originlate Middle English: from Latin potentatus ‘dominion’, from potent- ‘being able or powerful’, from the verb posse.