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Philippe IV of France had three daughters: Blanche, Marguerite and Isabelle.

Marguerite, the eldest, was born in 1288, but died in 1294, aged six. She'd been betrothed to Fernando IV of Castile since April 1294.

Blanche, the second-eldest, was born in 1290, but died in April 1294. She was betrothed to Fernando IV since 1291*.

Lastly, there was Isabelle, born in 1295. She married Edward II and we all know how that went.

*If it is correct that Marguerite was her father’s oldest daughter, it is unclear why she was not betrothed to Infante don Fernando in [Apr] 1294, the date of his betrothal to her supposed younger sister Blanche (unless there was confusion about the year of Blanche’s betrothal and that Marguerite’s betrothal to Fernando preceded hers). One possibility is confusion in the order of birth of the king’s daughters.
Now, assuming minimal butterflies, what if Blanche/Marguerite were to survive. The Castilian court broke off all marriage negotiations on Sancho IV's death, otherwise it would probably have been likely that Isabelle would've wound up in Castile instead of London.

Isabelle not being her father's only daughter is going to have effects on her development, no? For instance, even if she were to contrive a Tour de Nesle type scenario, what would she profit by it? Chances are that her elder sister has produced a son/s by then.

Not to mention that if as OTL, the direct Capets were to still go extinct, Edward III of England would have a much harder time to claim the French throne, would he not? Here he's neither the senior heir of Philippe le Bel nor even the only grandson.

Thoughts?
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