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Was reading through another thread, when I got this idea:
Edward III's eldest daughter, Isabella married relatively late in life for the day. However, Barbara Tuchman's book mentions a prior engagement to the count of Flanders, Louis (II) de Male. His wiki supports this, but points out that it was more desire of the guilds who had organized this marriage than Louis himself. So he fled to the French court and married the daughter of the duke of Brabant instead.
But what if Louis doesn't flee (or his attempt is unsuccessful) and the marriage to Isabella goes through. It might be unhappy, she's described in her wiki as indulged/pampered/spoiled, and he might resent it because it's foisted on him. But let's say she doesn't manage to talk her father out of it (as she did with the sieur d'Albret), and she gets packed off to Flanders, he gets forced to the altar, and they have a reasonably fair marriage for the time (neither likes each other but they do their duties (him fathering heirs, her birthing them)).
How does this affect things in England and Flanders? Who does Louis' jilted Brabantian bride marry? How does France react to this?