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In an earlier Thread I posited a WI to give an English King better prospects for French lands. Let's discuss this more thoroughly.

Basically Edward III's first wife Philippa of Hainaut dies c1335 - let's say complications over her childbirth of Joan.
Edward then married Joanna heiress of Penthievre and niece of Duke John III of Brittany.

When Duke John c1341 dies, during the latest part of the HYW, the nobles support Edward against Count John of Montfort who ATL gets French support.
With John of Montfort's death roughly as OTL in 1345 Edward is Duke of Brittany.

Edward and Joanna have children as follows:

John b1338 future Duke of Brittany
Guy of Brest b1339/40 married to the Countess of Ulster (like OTL Lionel) - dies childless
Edmund b1341 future Duke of Lancaster - marries 1st Blanche of Lancaster, 2nd Constance of Castile
Thomas b1342 future Duke of York - marries Isabella of Castile

We'll assume counteracting butterflies so that Edward's sons intervene in Castile roughly as OTL, and Betrand de Guesclin fights for France.

A slightly different Treaty of Bretigny confirms John as Duke of Brittany in return for a smaller Aquitaine.

Richard of Bordeaux succeeds as OTL as Richard II; Edmund and Thomas becoming Lords Appellant eventually dispossessing Richard in favour of John of Brittany.

So what happens next?
How could the HYW continue?
What happens with the succession of France while England has a ruling House of Brittany? Do we get a slightly more successful Dual Monarchy?
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