Every city needs a 'founder faction' that determines appearance, recruitment, culture, etc. One of the things this also does is makes a rebelling city sometime decide to join its 'founder faction'. Galatians in Thrace and Galatia are Celts and most like the the two 'Gallic' factions for EB so they are set to Aedui and Arverni.
If peace were established in Gaul, they would have been capable of greatness. Luckly for the Romans they had many 'civil wars'. Unlucky for you and your Romans, they ended their civil war.
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