Rare ones I've seen:
- Aquileia (I don't think this'll be rare for long, as anyone with a grudge against Venice tends to punch it out of them)
- Lebanon
- Tafilalt
- Northumberland
- Zaporozhie
- Nizhny Novgorod
- Doughlat
- Khalkha
- Zunghar
- Bashkiria
- Qasim
- Danzig (which, being Catholic, never formed Prussia despite owning all the required provinces)
- AI-formed Ruthenia
I've yet to see York, Lancaster, Habsan, Khandesh, the Jalayirids and one or two of the really out-there hordes, to name a few.
- Aquileia (I don't think this'll be rare for long, as anyone with a grudge against Venice tends to punch it out of them)
- Lebanon
- Tafilalt
- Northumberland
- Zaporozhie
- Nizhny Novgorod
- Doughlat
- Khalkha
- Zunghar
- Bashkiria
- Qasim
- Danzig (which, being Catholic, never formed Prussia despite owning all the required provinces)
- AI-formed Ruthenia
I've yet to see York, Lancaster, Habsan, Khandesh, the Jalayirids and one or two of the really out-there hordes, to name a few.