Byzantine Antioch.

Antioch was recaptured by the Byzantines in 969. WI: They had not been able to recapture it? What would its future have been? Would the Mongols have captured it?
 
I don't think that this will have much of an effect on history. The Crusaders might not have to surmount such well constructed fortifications when they besiege the city.

IOTL the Mongols never got as far as Antioch. They sacked Aleppo, but they never made it to Antioch to besiege it.
 
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