Rome would be tricky. They could do Antony and Cleopatra vs Octavian but that would probably feel a little too close to Origins. They could do the birth of Christ but that would be too controversial. The fall of Rome would be kind of interesting I suppose but it might not feel big enough after we've been dealing with Caesar, Cleopatra, Socrates, and Leonidas for two games. One area I thought they could do was Alexander the Great but focus on his conquests in India. He's significant lore wise and it would let us explore a totally new location while still being a logical end to this trilogy.