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Rather surprised that a search turns up zip on this matter, but it's something I've found myself wondering of late:
Louis XIV had three legitimate sons by his queen:
Louis le Grand Dauphin (1661-1711)
Philippe Charles, Duc d'Anjou (1668-1671)
Louis François, Duc d'Anjou (1672-1672)
We all know how the build-up to the Spanish succession went, and how messy it got for all involved, especially when the Allies started worrying about a possible Franco-Spanish union after the deaths of three dauphins and a dauphine in a row in 1711/1712 moved Philip V anxiously closer to the French throne.
But, what if Le Roi Soleil has a second son to survive, (maybe the older of the dukes of Anjou?) and the dauphin still marries and multiplies as OTL, then even if the events of 1711/1712 still occur, the Spanish claimant is not only LXIV's son/grandson, but further removed from the French throne than Philip V was.
How might history play out if one of the Anjous doesn't die?