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The victory of John's army at Mirebeau against the alliance of Arthur of Brittany and Hugh X of Lusignan led to Arthur's capture and eventual disappearance. What might happen if Arthur and co. won, or even killed John? Seeing as Arthur and Hugh were allies, I'd imagine one of the terms of victory would be for a renewal of the betrothal between Isabella of Angouleme and Hugh's son. But what support would Arthur have outside Brittany, Maine and Anjou?

Philip Augustus had already invaded Normandy, discontinued his support for Arthur and married his son to John's niece. Would he recognise Arthur or just keep conquering as he did IOTL under John?
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