While the Celts weren't quite the universal merchants that the Hellenes or Carthaginians were I'm sure they "culturally colonised" areas at least as often as they invaded them. Is this a case of the locals adopting cool Celtic imports rather than being conquered?
However ATHM's question is a fair one. Does the presence of Celtic material culture (eg in the Pontic Steppe) suggest an area would be more amenable to a celtic* overlord than somewhere without Celtic material remains? What about Celtic style troops? AOR perhaps, or Mercs? The engine has a few tools for the team to play with here.
*I suppose this means Gallic or Brithonic in EB2 terms, unless we're getting Bastarnae...
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