Roman emperor born Lucius Domitius Ahenobarbus (4)

I believe the answer is:

nero

(Other definitions for nero that I've seen before include "Tyrannical Roman emperor" , "Roman arsonist and fiddler" , "Cruel Roman emperor" , "He's reputed to have fiddled while Rome burned" , "Roman emperor on the fiddle?" .)

I've seen this clue in The Independent.

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