a person who possesses great power, as a sovereign, monarch, or ruler.
power, dominion. See
a person who possesses great power or authority, esp a ruler or monarch
[C14: from Late Latin
ruler, from Latin: rule, command, from
to be able]
Collins English Dictionary - Complete & Unabridged 10th Edition
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As for the queen, she is so far from being a decisive potentate that she can seem goofily out of the loop.
In his later years, he was the potentate of a party that had long stopped believing in its own slogans.
If luscious diversity characterizes the tropical east, then in the domain of the western potentate productivity is king.