Caesar Augustus or Napoleon (7)

I believe the answer is:

emperor

'caesar augustus or napoleon' is the definition.
(I know that Augustus is a emperor)

This is all the clue.

(Other definitions for emperor that I've seen before include "Large richly-coloured butterfly" , "He rules over several states" , "Pre-Rome (anag.)" , "Largest type of penguin" , "Nero or penguin" .)

I've seen this clue in The Irish Times.

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