As promised:

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Although this opens up the whole roster (for now... things may change...), there is also a 'regular' building dependency too. This one doesn't allow any valour upgrades, whereas the regular building line does. It is meant to represent the flow of migrating Celts into new areas. To get teched-up troops though, the province needs to be settled for a while, so the facilites can be built.

I'm seriously considering moving the faction back out of the FN_07 slot - this was designed for the Vikings, of course, and worked quite well when I used it for the Sea Peoples in the Bronze Age mod, but here the conversion issue is just too prevalent. For one thing, the Gauls aren't sea-borne invaders, so they can't escape at the drop of a hat like the Vikings do. Secondly, they are going straight into 'catholic' land, and although they 'paganise' it quickly, it's not quick enough (whereas the Sea Peoples went straight for 'muslim' territory in that mod, and they don't convert in that direction). If they lose a single pagan province, their new conquests are generally not pagan enough to maintain the numbers, and their 'home' province is not safely tucked away overseas, so can be taken much more easily. All in all, it's a deal-breaker, unless my last couple of ideas work out better.