If you play a far-east faction the development of the western powers is very interesting check out my posts in faction progression thread and it's very interesting how things change. If you're not near them they will fight each other as soon as they share a long enough border and don't have another front open.
As soon as the Lusitans kicked out Carthage they started fighting the Aedui who were close to finishing off the Sweboz, than the Romans joined in allied with the Lusitans and pushed the Aedui north a lot, as soon as the Lusitans stopped sharing borders with the Aedui they made peace and went at the Romans, very cool stuff.
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