Rex (title)
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The Latin title rex has the meaning of "king, ruler" (monarch).[1][2] It is derived from Proto-Indo-European *h₃rḗǵs. Its cognates include Sanskrit rājan, Gothic reiks, and Old Irish rí, etc. Its Greek equivalent is archon (ἄρχων), "leader, ruler, chieftain".
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The chief magistrate of the Roman Kingdom was titled Rex Romae (King of Rome).