This is just one thought, but perhaps there could be a part 1.5 for 0 A.D. In this part, the Achaean League, Macedonia (from the times of Philip the V and Perseus), the Aetolian League, the Seleucids, possibly the Illyrians, Carthaginians, Romans, Ptolemies, Celts, Iberians, and Maccabees could be included.