Idea: the First Barons' War claims the lives of both King John and Louis VIII

[My Username is Inigo Montoya]

It's 1217. After the passing of the little regretted John, peace is finally returning to the England, under its boy king Henry III; but the war also claimed the life of prince Louis, only son to Philip II of France. The aged king always opposed this fool's errand which now cost him his heir.

Is it an interesting scenario? Discuss...

 

[The Professor]

I'm not sure much changes in the immediate aftermath.
Early death for Louis means his eldest son will be under a regency after Philip. This probably means the reductions of English Aquitaine aren't as big and the second phase of the Albigensian Crusade goes better for the Pyrenees.
No Charles of Anjou as King of Naples.

 

[My Username is Inigo Montoya]

I'm not sure much changes in the immediate aftermath.
Early death for Louis means his eldest son will be under a regency after Philip.

Philip may die earlier than OTL, of sorrow. However, assuming he doesn't, Louis IX will succeed to the throne at the age of nine, ironically the same age as Henry III of England.

This probably means the reductions of English Aquitaine aren't as big and the second phase of the Albigensian Crusade goes better for the Pyrenees.

Both things that may improve the relations between England and France in the medium term...

 

[HortenseMancini]

I'm not sure that much would change besides Louis IX having only one surviving brother instead of three.