Persian king, subject of an opera by Handel (6)

I believe the answer is:

xerxes

(Other definitions for xerxes that I've seen before include "Ancient Persian king" , "------I, son of Darius I, attempted invader of Greece, 480-79 BC" , "Name of two Persian kings" , "ruler after Darius" , "King of Persia, son of Darius" .)

I've seen this clue in The Sun.

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