WI Isabella I of Castile had died before taking the throne?

Just an idea: Isabella of Castile dies in 2 October 1470, during the birth of her first child (her daughter also named Isabella). The baby dies too. What happens next? She and Ferdinand had the backing of the nobles who opposed Henry IV of Castile and (later) Juana (called la Beltraneja). Now, without an alternative claimant, would they accept Juana? Or would they support John II of Aragon and Ferdinand as the legitimate Trastamara claimants? What would Ferdinand do?
 
Just an idea: Isabella of Castile dies in 2 October 1470, during the birth of her first child (her daughter also named Isabella). The baby dies too. What happens next? She and Ferdinand had the backing of the nobles who opposed Henry IV of Castile and (later) Juana (called la Beltraneja). Now, without an alternative claimant, would they accept Juana? Or would they support John II of Aragon and Ferdinand as the legitimate Trastamara claimants? What would Ferdinand do?

AFAIK, OTL there were Aragonese nobles that urged Fernando to claim Castile (after Isabel's death) as male-line Trastamara claimant, to avoid the Habsburgs gaining Castile. Fernando refused. Again, after Isabel's OTL death, Enrique IV's will supposedly made its way into Fernando's hands, in which he [Enrique] claimed that la Beltraneja was his daughter and that he had been "forced" to denounce her. Fernando apparently contemplated marrying la Beltraneja as a way of disinheriting his kids by his first wife - who he had no qualms calling a usurper if it justified his end of a united non-Habsburg Spain.

Maybe Enrique decides that Juana and Fernando getting married is as good as idea as any.
 
AFAIK, OTL there were Aragonese nobles that urged Fernando to claim Castile (after Isabel's death) as male-line Trastamara claimant, to avoid the Habsburgs gaining Castile. Fernando refused. Again, after Isabel's OTL death, Enrique IV's will supposedly made its way into Fernando's hands, in which he [Enrique] claimed that la Beltraneja was his daughter and that he had been "forced" to denounce her. Fernando apparently contemplated marrying la Beltraneja as a way of disinheriting his kids by his first wife - who he had no qualms calling a usurper if it justified his end of a united non-Habsburg Spain.

Maybe Enrique decides that Juana and Fernando getting married is as good as idea as any.

I for one would like to see a Fernando+Juana marriage, just to see the fun and games that will ensue from that.
 
But couldn't John II claim the throne as soon as Henry IV dies? And would he have support for it?
 
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