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I'm making a TL where Castile and Aragon remain separate. The PoD is Alfonso, Prince of Asturias lives. Enjoy...

Henry IV of Castile was a weak King. Under Henry, lawlessness flourished. Henry was unable to produce an heir with his first wife, Blanche of Navarre, so he re-married to Joan of Portugal for a Portuguese alliance. Yet Henry and Joan failed to have an heir and rumour spread that Henry was impotent. Then six years into the marriage, Joan produced a daughter, Joanna, to the shock of the kingdom. Surely, they would not have to endure a possible regency! And the threat of a regency loomed, as Henry was far from young. The future would be much better under Henry's half-brother, Alfonso.

Rumour spread that Joanna was not Henry's daughter but that of Joan's supposed affair with Beltran de La Cueva, Duke of Albuquerque. Joanna was mockingly named 'la Beltraneja'. In 1464, Henry agreed to name Alfonso as his heir. He reneged on the agreement, prompting Henry's enemies to declare Alfonso as King Alfonso XII. Civil war erupted in Castile. In 1469, Henry backed down and agreed that Alfonso was his heir, provided that he marry Joanna[1]. Henry died five years later and Alfonso was crowned King Alfonso XII of Castile.

Alfonso's sister, Isabella, married Ferdinand, Prince of Girona, son of Juan II of Aragon. On his deathbed, Juan II divided his kingdoms, with his daughter Eleanor by his first wife Blanche I of Navarre getting Navarre and Ferdinand getting Aragon. Then Juan died and Ferdinand became Ferdinand II of Aragon. Ferdinand and Isabella had three children; Infante Juan, Prince of Girona, and the infantas Joanna and Isabella. Ferdinand and Louis XII of France were bitter rivals. They partitioned Naples but Ferdinand broke his agreement with Louis XII. The French were expelled from Naples and Ferdinand gained the Neapolitan crown, leaving the French to rule northern Italy, for the time being.



[1] In OTL, Alfonso died in 1468.
[2]Yes, OTL Isabella I

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