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Apparently there were negotiations between Timur and Aragon. What if the came to a deal where Aragon would provide naval support and get trade deals and they made common cause to ravage mutual enemies like the Byzantines, Ottomans and Venetians.
Even post Timur and his successors does this have the potential to entangle Aragon with eastern alliances and trade routes such that is never an Aragonese-Castilian expansion into the Atlantic?