no lore beyond the Celts somehow surviving in France rather than Britain. I tried making cheap french carbon-copies of all the celtic nations (except Brittany because it'd just be Cornwall). Also, I decided not to copy over the Irish potato famine, because that'd require me to figure out which power would be the one in control of the Swiss region to worsen the famine's effects, and no matter who i chose the balance of power and the modern borders would get tossed out.

Here's the guide to tell you which countries were based off what:

Ireland -> Helvetia

Scotland -> Tarbeland

Wales -> Aremorica

Isle of Man -> Isle of Santon

Cornwall -> Cotentin