I'd like to see something like this for Ireland:
Black lines being nation borders, with a couple more OPMS (Tyrconnell in purple, with Leinster split into Wexford in orange and Kildare in blue). That would put Ireland at 8 provinces, equal to Scotland and about half of England (which would be historically accurate if province density = population density now).
Here's a map from 1450 for comparison:
