Emperor whose mother was Agrippina the Younger (4)

I believe the answer is:

nero

(Other definitions for nero that I've seen before include "Fiddling Roman emperor" , "He's reported to have fiddled while Rome burned" , "Ancient Roman emperor" , "Roman Emperor notorious for vice and luxury" , "Notorious Roman emperor, d. AD 68" .)

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

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