Imperium Romanum has 35 scenarios covering the entire period of the Roman State/Empire from its birth to its demise. The map covers the entire Roman Empire and is hex based. The back of the box says "Imperium Romanum is the definitive game of the Roman Empire". It is certainly the most detailed, yet it is relatively easy to understand, and fairly intuitive to play.
I have designed a two player Crassus vs the Parthians scenario for those interested in the disastrous Crassus campaign. The original was included in the six player "Crisis of the First Triumvirate" scenario, and it was not suitable for two players.
Cities in undefended areas are prone to surrender. When Caesar marched into Italy many cities opened their doors to him because Pompey ran away. Updated.
This is the forms on the last page of the IR II rules. These are the forms you need to play the game. Permission granted to photocopy by the publisher.