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So, IOTL Henry IV of Castile was believed to be impotent, as his two wifes couldn't get pregnant. When his second wife Joan of Portugal gave birth to his daughter Joanna La Beltraneja the nobilitybelieved that she was a bastard, and it sparked the conflict that would eventually lead to Isabella I and Ferdinand of Aragon becoming the monarchs of an united Spain.
However, WI Henry got more luck and had a son by his first wife, Blanche II of Navarre? What would be the effects of it? Would the nobility still rebell against him for other reason? And what could be the consequences in Navarre? Any ideas?