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What if Anne of Austria in 1640 gives birth to a girl - say Anna-Maria de France, Madame Royale?
If Louis XIII dies on schedule (he likely will), what implications will result from:
1. Gaston d'Orleans still being heir presumptive - this time to child king Louis XIV? Will the Fronde play different (maybe with plot to kill/kidnap child king and then crown Gaston as Jean III of France (I think he'll take his second name as his regnal one cause Gaston I sounds a bit silly).
2. Madame Royale reaching marriageable age by late 1650ies and being the most obvious match for Charles II if Restoration plays as OTL. Another candidates are Leopold I of Austria and Duke of Savoy (Alphonso of Portugal is likely rejected).