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If William VIII of Aquitaine had no son (in OTL a son was born in 1071) and his daughter Agnes had a son with Alphonse VI of Castille is it possible that upon the death of William VIII in 1086 Aquitaine passed to castillian control? With Alphonse VI acting as a "regent" for his infant son
What happens next? How is the french King reacting to that?
Could Alphonse VI used the resources from Aquitaine to fund an early reconquista?