AI factions progress in campaign.

[Macilrille]

It is usually a 50 - 50 whether AS becomes the Gray Ddeath or Ptolies become the Yellow Fever. I find usually the Romans kick the Gallic factions and butt heads with Sweboz and Lusos.

You can check the "AI Progression" Thread in the AAR section, with pics.

You can use the console to give factions in trouble money and you can DL the mod that makes them expand more historically.