Anachronisms: Octavia is asked for some poetry, and quotes the lines starting "Easy it is to descend into hell ...", a famous passage from Vergil's Aeneid. At this point Julius Caesar is still alive (therefore 44 BC at the latest). In fact the Aeneid was written at the end of Vergil's life, 30 to 19 BC, when Augustus (Octavian) was emperor.
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