Possible Clues:

• A scare perhaps for the Romans?
• He did not beware the Ides of March
• 'Arrest that woman', said the emperor
• Roman chief like Julius
• Figure in many busts
• Never to be suspected his wife may undergo one?
• Emperor waves, standing in anachronistic means of conveyance?
• Title of the Roman emperors
• 'Et tu, Brute?' utterer
• Ciaran Hinds, on "Rome"