Principality of Antioch

It fell to Sultan Baibars in 1268. Could it have lasted longer, perhaps with a more viable Armenian/Mongol alliance?
 
No without a good earlier POD.

Mongol/Antiochean alliance was viable, but mongol dominion was simply too big and theire issues too dispersed for allowing them to intervene every time the crusaders needed it.

Baybars made fun of this point exactly on a letter he sent to Latins.
 
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