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A marriage alliance

After the signing of the Treaty of Le Goulet, and feeling offended by Philip, Arthur fled to John, his uncle, and was treated kindly, at least initially. However, he later became suspicious of John and fled back to Angers, both he and his mother were surprised of the betrayal by Philip that by her death on the latter part of 1201, which would cause Arthur to find someone to help him in his claims to England, his mother would recover from the birth of his two youngest sisters, Margaret and Catherine and she would advice him against both Philippe and John and she would urge Arthur to find allies against them.

On the end of 1201 Arthur of Brittany would marry his eldest sister Eleanor of Brittany to Peter II of Aragon, this would give Arthur of Brittany a supporter in his own claim to England and Aquitaine which is now controlled by John of England and also the legitimacy of Peter II to claim the lands of the Count of Toulouse which are from his ancestor Philippa, the late Countess of Toulouse who was disinherited by her father, the marriage between Eleanor of Brittany and Peter II of Aragon ruined the alliance between Peter II and Raymond VI of Toulouse denying the marriage match between Eleanor of Aragon and Raymond VI of Toulouse because Peter II is now a claimant to the county.

Eleanor of Brittany would provide Peter II, two daughters named Constance(1202) and Eleanor(1206) and two sons named James(February 2, 1208) and Peter(June 2, 1215), the marriage would stabilize the alliance between Aragon and the case of Arthur against King John and Philippe Auguste.
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