Filius Agrippinae, princeps post Claudium creatus (4)

I believe the answer is:

nero

(Other definitions for nero that I've seen before include "Roman Emperor, 54-68 AD" , "Cruel Roman emperor" , "Emperor (who fiddled while Rome burned?) d. AD68" , "Tyrannical Roman emperor" , "Roman 9" .)

I've seen this clue in The Times.

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