Nephew of Caligula (4)

I believe the answer is:

nero

'nephew of caligula' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for nero that I've seen before include "Cruel Roman emperor" , "Ruler" , "Roman tyrant" , "Roman emperor on the fiddle?" , "Roman 9" .)

I've seen this clue in The Wall Street Journal.

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