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The War of the Castillian Succession (1475-1479) was the conflict that pitted Isabella of Castile, who was the stepsister of Henry IV de Trastamara, and OTL Isabella I, against the pretender and Henry's daughter Joanna la Beltraneja. The conflict pitted Aragon fighting for Isabella against Joanna's faction supported by Portugal and France.

The war ended with Alfonso V renouncing his claim to the Castillian and Aragonese throne, and likewise, Ferdinand II and Isabella I renouncing their claim to the Portuguese throne. Not to mention Joanna losing her claim as Queen regnant of Castile and Queen consort of Portugal.

Now what if somehow, Joanna's faction would've succeeded in winning the war? What would become of Isabella? Would Portugal unite with Castile in a personal Union, and perhaps form an alternate Spain with/without Aragon? And what of Aragon? It could possibly threaten Aragonese claims to Rousillon and Italy (at the time Sardinia, and Sicily).
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