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WI William Aigret (1126-1130), the only legitimate son of William X of Aquitaine, had managed to survive childhood and succeed his father to the Duchy of Aquitaine? Let's assume that butterflies are kept to a minimum in this scenario, and William X dies of food poisoning in 1137 while making a pilgrimage to Santiago de Compostela.
What is likely to happen? With *William IX still a minor at age eleven, who will assume the regency? Perhaps one of Obviously an independent Aquitaine in the twelfth and thirteenth centuries--assuming *William XI has heirs and the House of Poitiers retains the duchy and its territories--is going to have major effects and butterflies galore. Perhaps Aquitaine will regain Toulouse in the near future? The (rather appealing) idea of *William XI potentially wedding Petronilla of Aragon and laying the foundations for an Occitan kingdom comes to mind (assuming of course that she is still born in 1136, and, assuming that the immediate butterflies in the first few years following 1130 are not great, I don't see why not). I also can see Eleanor of Aquitaine still wedding Louis VII, and perhaps she'll manage to bear him a son and the union will be slightly more successful, dynastically speaking, than OTL.
If this question has been asked before, I apologize, but after probing through this board's archives I was (surprisingly) at a loss to find anything.