WI Edward III marries Joanna II of Navarra?

What happens if Edward III marries his first cousin, Johanna II of Navarra?

Well for one it would definitely strengthen his claim to the French throne. And, considering the vast estates Joan II held across Northern France, it could end up creating a smaller version of the old Angevin empire. Aside from that, I'm not really sure.
 
Ok, if everything goes as IOTL, the French barons as well as the King of France (Philippe V ?, Charles IV ?, Philippe VI ?) will never agree that Joan marries a foreign prince (even if Edward is half-French by his mother and speaks French). I think that the reason behind it, was that people in her time were conscious that Joan had a strong claim to the throne and that she could be a potential heir to the throne after the death of her brother (John I) and even after the death of Charles IV! So they didn't want Joan to probably bring France as dowry to a foreign King. That is why once Philippe V was on the throne, Philippe of Évreux married Joan in order to appease the barons' fears .

Moreover, Joan was a heiress to Navarre, Champagne and Brie and extensive lands in Northern France and had an ally into the powerful duke of Burgundy, Odo IV. If Edward marries her he ends up with multiple claims from the Pyrenees to the the Channel (as Emperor Constantine said) but also with problems with the French, if he married her before 1328. But even after that her claims could be seriously considered, if you look at her son Charles who managed to put Normandy in a state of rebellion against the Valois. Thus Edward will be looking for a bunch of problems .....but that could make a terrific timeline.
 
I wonder if this would be possible to achieve during Edward III's visit to France in 1325. Joan of Navarre had been "married" at the age of six to Philippe d'Évreux; the marriage could, of course, be annulled at any time given her inability to consent. If Isabella was unable to garner sufficient support to invade England and Edward dallied in France a while longer, a marriage to Joan might be possible: especially one where a young and enterprising cousin abducts her/does so without going through official channels (ie, promises marriage in private before chosen witnesses and then lays with her). While Edward III claimed the succession as Charles IV's closest male relative, Joan's son (should one be born in time) would also have a strong claim (in accordance with the legal arguments later employed by Edward's lawyers): marriage to her would combine their claims and give him a power-base in the very heart of France.

A possible POD might be a disagreement over Philippa of Hainault's dowry, stopping negotiations in their tracks and forcing Isabella to return to France in search of a sufficiently rich bride for her son. Maybe she'd even swap significant chunks of Joan's patrimony in exchange for greater financial aid from her brother.

Indeed, if Edward III was still in France at the time of King Charles' demise, he might put forward a good case for the Regency: particularly if he has a newborn son he can betroth to the young princess Marie.
 
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