AHC/WI: Aragon in personal union with Aquitaine

I don't know if personal union is the right word. But, what if either the Dukes of Aquitaine or the Kings of Aragon managed to inherit either the kingdom of Aragon or duchies of Aquitaine respectively?
 
So let's say William Aigret, brother of Eleanor of Aquitaine, doesn't die at the age of four and weds Petronila of Aragon, who is ten years younger than he is.

William XI (b. 1126, d. 1180), Duke of Aquitaine, m. Petronila, Queen of Aragon (b. 1136, d. 1175):

Peter (b. 1152, d. 1212)
William (b. 1154, d. 1201)
Alionora (b. 1155, d. 1158)
Alfonso (b. 1160, d. 1228)
Petronila (b. 1160, d. 1202)

So we have Peter become the King of Aragon and the Duke of Aquitaine.
 
This may lead to an even more interesting division in France, with Normandy and Anjou already in union with England. If the union between Champagne and Navarra still happens ITTL, then it's really interesting. The Capetians would still get some chances, but it's harder against more powers, which most likely won't all have a bad ruler at the same time.

As for the Reconquista Aragon-Aquitaine could play a somewhat more prominent role, maybe an Aragonese Murcia ITTL and some other bits.
 
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