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Jeanne, Queen of Navarre, was originally intended as a wife for Edward I's eldest son. However, the lads (first Henry and then Alphonso) kept dying. Edward's eldest son, John died before Jeanne was born and IIRC he was promised elsewhere.
However, I can't find a former betrothed for Philippe (although until 1276 he was the second son). So, in this world where Jeanne weds Prince Henry/Alphonso, who does @Philippe le Bel wed?