Plantagenet Brittany

I'm aware this scenario may border on ASB, but humor me, please:

Arthur I, nephew of Richard I, leaves a male heir when he dies (he can die on schedule or shortly thereafter). John Lackland has succeeded as king of England, and the other titles he usurped, so Arthur is only holding Brittany - and maybe one or two other French fiefs of the Angevin Empire. This male heir is under the regency of his mother - let's make her Constance of Toulouse or Sancha of Aragon, rather than the French princess Arthur was betrothed to, only so that it is easier for Arthur to leave a child (the French princess was only born in '98).

By treaty (probably sometime before Arthur's death (which is likely to still be blamed on John) which is before the birth of Henry III) Arthur's line is acknowledged as heirs to England after John's kids or in default of their being a Johannine heir.

Now, Arthur's little sprig establishes a cadet branch of the Plantagenets in Brittany. John can't get too heavy handed once this kid is an adult, or else the barons in England won't be inviting the French king, but rather the duke of Brittany over the Channel (but he probably still will, things will escalate and...)

Say this Plantagenet-Anjou branch Brittany lasts about 100-150 years (it's when the House of Montfort took over OTL), how does this influence England's relations with France and vice versa. Might we see a duke of Brittany aspiring to the throne of England? The king of France willing to stir the pot?
 
I'm aware this scenario may border on ASB, but humor me, please:

Arthur I, nephew of Richard I, leaves a male heir when he dies (he can die on schedule or shortly thereafter). John Lackland has succeeded as king of England, and the other titles he usurped, so Arthur is only holding Brittany - and maybe one or two other French fiefs of the Angevin Empire. This male heir is under the regency of his mother - let's make her Constance of Toulouse or Sancha of Aragon, rather than the French princess Arthur was betrothed to, only so that it is easier for Arthur to leave a child (the French princess was only born in '98).

By treaty (probably sometime before Arthur's death (which is likely to still be blamed on John) which is before the birth of Henry III) Arthur's line is acknowledged as heirs to England after John's kids or in default of their being a Johannine heir.

Now, Arthur's little sprig establishes a cadet branch of the Plantagenets in Brittany. John can't get too heavy handed once this kid is an adult, or else the barons in England won't be inviting the French king, but rather the duke of Brittany over the Channel (but he probably still will, things will escalate and...)

Say this Plantagenet-Anjou branch Brittany lasts about 100-150 years (it's when the House of Montfort took over OTL), how does this influence England's relations with France and vice versa. Might we see a duke of Brittany aspiring to the throne of England? The king of France willing to stir the pot?


A marriage of Arthur with Constance of Toulouse means Eleanor of Brittany is marrying the father of the bride, A marriage of Arthur with Sanchia means Eleanor of Brittany is marrying Peter the catholic, in OTL Philip II was trying to have her married to one of the Dreux brothers or to himself which did not happened because Arthur and Eleanor were captured before such marriage would happen..
 
The who is marrying who isn't overly important, and IDK if the Count of Toulouse would be free to marry Eleanor, since he was married to Leonor of Aragon after 1203, and since he was Eleanor's uncle by marriage, it would be requiring of a dispensation, which can either take too long in arriving or be blocked or she can already be married elsewhere - Burgundy or Navarre (to Constance's OTL husband) or one of the Dreux boys, perhaps, I guess it depends - but that's sort of besides the point. The point is that Arthur is married to Constance or Sanchia, and has a legitimate son, which means Eleanor's moving down in the succession, and Brittany and England are ruled by two branches of the same family.

How does everyone act around this. And how much of the Angevin Empire in France can the Bretons realistically claim if they were of a mind to it (say during the regency of Henry III)?
 
The who is marrying who isn't overly important, and IDK if the Count of Toulouse would be free to marry Eleanor, since he was married to Leonor of Aragon after 1203, and since he was Eleanor's uncle by marriage, it would be requiring of a dispensation, which can either take too long in arriving or be blocked or she can already be married elsewhere - Burgundy or Navarre (to Constance's OTL husband) or one of the Dreux boys, perhaps, I guess it depends - but that's sort of besides the point. The point is that Arthur is married to Constance or Sanchia, and has a legitimate son, which means Eleanor's moving down in the succession, and Brittany and England are ruled by two branches of the same family.

How does everyone act around this. And how much of the Angevin Empire in France can the Bretons realistically claim if they were of a mind to it (say during the regency of Henry III)?

I think Robert of Dreux or Hugh of Lusignan is the likely husband for Eleanor if the OTL scenario ends with Arthur surviving and marrying within France like in Toulouse, Constance's marriage to the King of Navarre was annulled and childless prior to the POD

I think Sanchia marrying Arthur would also lead to Peter III of Aragon marrying Eleanor of Brittany which butterflies the acquisition of Aragon of Montpellier, Eleanor marrying Sancho is also possible, the Burgundians I believe wanted to marry either Eleanor or one of her Blesvin cousins..
 
I think Robert of Dreux or Hugh of Lusignan is the likely husband for Eleanor if the OTL scenario ends with Arthur surviving and marrying within France like in Toulouse, Constance's marriage to the King of Navarre was annulled and childless prior to the POD

I think Sanchia marrying Arthur would also lead to Peter III of Aragon marrying Eleanor of Brittany which butterflies the acquisition of Aragon of Montpellier, Eleanor marrying Sancho is also possible, the Burgundians I believe wanted to marry either Eleanor or one of her Blesvin cousins..

Now that that's out of the way, where does Brittany go from here?
 
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