I'm quite curious as to how successful a relationship between a Christian Monarch and a Caliph would be. We've seen Caliphs subordinate to Turks, Persians, and other rulers - and whilst extreme, in a situation where you have a strong surviving Roman Empire that pushes Islam back, or Crusaders, or a Nestorian Persia, what sort of relationship could you see between a Caliph under Christian protection? (i.e. based in Nestorian Baghdad, Christian Jerusalem, or Roman Constantinople?)
What are your thoughts? Could it last? Would it lead to two Caliphs (and if so, what sort of relationship would they have beyond simply antagonistic), would it cause a rift in Islam?
What are your thoughts? Could it last? Would it lead to two Caliphs (and if so, what sort of relationship would they have beyond simply antagonistic), would it cause a rift in Islam?