On my personal note there's no such thing as "unimportant" in history...
As for regions what they need to represent is the population, iirc Ireland in EBII will have only one region, that's quite a drawback, still it's pretty hard to cope with scarse information and the game's limitation...
But the British Isle must have a decent number of settlements in order to give them a comparable demographic weight as they had at that time...
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