Great-grandfather of Nero (7)

I believe the answer is:

agrippa

(Other definitions for agrippa that I've seen before include "Powerful Roman" , "Marcus -, Roman fleet commander who defeated Cleopatra at Actium" , "one of the Herods" , "General advisor for emperor" , "General who beat Mark Antony at Actium" .)

I've seen this clue in the King Feature Syndicate.

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