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Latin word rex comes from Proto-Indo-European *rek-, and later Proto-Indo-European *h₃rḗǵs (King, ruler.)
*rek- (Proto-Indo-European)
*h₃rḗǵs (Proto-Indo-European)
King, ruler.
*rēks (Proto-Italic)
King.
rex (Latin)
(Late Latin, chess) king. King, ruler.