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What if the Aragonese Crusade had defeated Peter III of Aragon and Charles, Count of Valois, son of the French king, Philip III, had become Carlos I of Aragon? With Aragon out of the war, Charles of Anjou would be able to keep Sicily under his thumb and France would reign supreme over Southern Europe.
What else could happen? If Louis X dies as IOTL, would Charles's son, Phillip (Felipe I of Aragon) also become king of France as IOTL? Would Aragon be annexed to France or would it be made an independent kingdom again under some French prince (i.e. any of Jean II's sons).