Oh BTW, we just finished a simulation in World 9 class. It took 2 days. People in the class were composite characters or groups (Julius a general, his army, the urban poor of Rome, etc. etc.). The simulation culminated in a huge battle (with dice) wherein the Parthian King and his army was backing a class of rich landowners and Senators who had armed the urban poor of Rome and Alexandria and turned them over to the General Julius. (The Urban Poor armies got -1 on dice rolls for being untrained). Meanwhile, Cleopatra, the Soca, the High Priest of Rome, Julius' army (having defected), Antony, his army and a Senator who had been captured by Julius but freed by the Antony - Cleopatra coalition were aligned against them. The merchants and a few other groups sat things out. After the carnage, the Parthian King died on the battlefield as did Cleopatra. Antony was on the run without an army and his Senatorial ally was dead. One of the Senators got himself declared tyrant immediately before the battle and was busy giving out land afterwards. It's unclear whether Julius was content with being the most powerful general or whether she was going to lead the troops against the Senate. The Senator who declared himself tyrant played a very patient waiting game. After the first day, he'd done almost nothing. Most of the action involved Antony and Julius jockeying for power by allying with Cleopatra and the Parthian King, respectively.
One of the more interesting outcomes of this iteration was that the merchants were constant targets but nobody actually got around to attacking them directly.
Two days well spent making the point that it took money, land, and armies to rule Rome and those resources had to come from somewhere usually via expansion.