It seems to me that all AI behaviour is influenced by player's faction. When I play as Mak's Roman AI always make peace with epeiros and try to reach me through Illyria, In my current campain Epirus was thrown from Greece and they forged empire in italy taking whole Sicily and Rhegion in addition to Taras, and have just started war with Rome, who concentrates efforts on northern frontiers.
On the other hand when I tried Bactria Romans took taras quite fast and started the struggle with Karthage on sicily
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