Verdi opera set during the fifth century (6)

I believe the answer is:

attila

(Other definitions for attila that I've seen before include "Great king of the huns" , "Devastating ruler" , "King of the Huns, invader of the Roman Empire" , "5th century king of the Huns who sacked Rome" , "The greatest Hun leader" .)

I've seen this clue in The New York Times.

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