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Philip Augustus refused to help his son, and Blanche was his sole support. Blanche raised money from her father-in-law by threatening to put up her children as hostages.
https://en.wikipedia.org/wiki/Blanche_of_Castile

What would be the effects if Blanche sent her children as hostages of John and Louis IX and Henry III grow up together, is there a possibility of Henry III or Edmund the Crouchback marrying Saint Isabelle..

Would there be any difference in the character of Louis IX..
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