One of the notable points of Medieval dynastic politics is the rarity of marriage between Muslim and Christian monarchs and their heirs. (Note : Rarity, not absence).
I'm quite curious as to what the repercussions would be of not only one, but many marital unions between Christians and Muslims at the royal level, and the offspring inheriting regardless of the faith they choose.
Would it happen? What interesting marital alliances could you see forming? Would there be an emergence of a Christian-Muslim mixed faith / world?