I've found a map which could fit in most things, including the Eastern Roman Empire.
it also fits in Italy and there's the possibility for Mongol territory in the eastern Black sea. Perhaps the English, the French and the HRE could be external forces like the Golden Horde. They appear if you can manage to convince the Pope that a crusade is needed, which could be an interesting aspect (say if Jerusalem or another importan place is lost). Just a suggestion.