Probably bordering ASB, but in this immense multi-Paradox game epic the AI goes all wacky with the death of Ogedei Khan, allowing the expanded Kingdom of Jerusalem (which had only been the Levant, Egypt, bits of Lebanon and Syria, and the entirety of Cyprus and Crete) to conquer all of Arabia and parts of Persia.
Suppose a similar (but much scaled back) crumpling of the il-Khanate and the Muslim states they defeated (such as the Sultanate of Rum) occurred following the Great Khan's death, and the Christian powers were able to capture a lot of the territory in the aftermath, including Mecca and Medina (yeah logistically speaking this is likely ASB).
What happens when you have crusaders conquering the geographical heart of Islam?
Suppose a similar (but much scaled back) crumpling of the il-Khanate and the Muslim states they defeated (such as the Sultanate of Rum) occurred following the Great Khan's death, and the Christian powers were able to capture a lot of the territory in the aftermath, including Mecca and Medina (yeah logistically speaking this is likely ASB).
What happens when you have crusaders conquering the geographical heart of Islam?