The most long-sustained storyline in Italy was Batista. I would draw something from that.

Assuming we are still talking about Civ, there are two ways you can go. The simple way means you can just reuse Rome's, because the production boost makes sense for a regime that tried to fortify its position in the country. The more complex route is something dictatorial. Perhaps +1 happiness for every military unit and -5 happiness for every civilian unit. Something like that.