England seems big enough, subdividing into even smaller regions than current shires may be too much. That said, as an englishman i'd be up for bigger England so hey.
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I know what you're thinking. "So what? That doesn't warrant splitting Kent in two, it's just semantics".
Rutland.Indeed, The Shacks. Berkshire, Hertfordshire, and Buckinghamshire were real counties, but they have never been counties in Crusader Kings games. It's a better map with them merged into other counties.
Was Bristol a county in CKI? It's too long since I've played to remember.
Ireland had at least two bishops during the 5 kingdoms period vying for the position of Archbishop, and Primacy over all of Ireland, based on whether they're the successor and heir of Patrick, or successor and heir of the oldest Church efforts in Ireland, although at appears that Armagh (the heirs of Patrick) won out.
In 1152 Tuam, Cashel and Dublin were raised to archbishop level, alongside Armagh, with Armagh having primacy. (Armagh is "Primate of all Ireland", Dublin is "Primate of Ireland").