I think the dev said that the game happens during "the year of the four emperors", so the mistake should be to say "Antonines" instead of "Flavians".There's a mistake in the main character's biography: the last of the Antonines was Commodus, not Domitian (who was the last of the Flavians).
I like the concept of the game and I will follow it closely but the UI is really unintuitive.