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Sometime during the crusades, crusader knights from the Kingdom of Jerusalem dragged several galleys overland until the reached the Gulf of Aqaba and from there, they went on to raid several Muslims ports in the Red Sea until they were eventually caught.

What if, the Crusaders launch a somewhat larger expedition than in otl, and once the reach the Red Sea, they are somehow able to march overland and take Mecca through trickery. From there, they desecrate the Kaaba and steal the Black Stone within the Kaaba and send it back to Rome?

First, is this possible? What are the defenses of Medieval Mecca like during the Crusades? Secondly, how would Muslims react. Would Islam temporarily unify and launch a massive war of religion against Christianity in an attempt to take back their stone, or would the Caliph just try to pay ransom money for it back like they did when the stone was stolen several centuries earlier?
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