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Latin word regem comes from Proto-Indo-European *rek-, and later Proto-Indo-European *h₃rḗǵs (King, ruler.)
*rek- (Proto-Indo-European)
*h₃rḗǵs (Proto-Indo-European)
King, ruler.
*rēgs (Proto-Italic)
*rēks (Proto-Italic)
King.
regis (Latin)