feb 6, 1475 BC - War of the Castilian Succession: Began

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When Henry died, he did not say in his will who should succeed him and take the throne. That is when Joanna la Beltraneja saw her opportunity. Joanna, Isabella’s cousin, attempted to become queen by bringing in help from her brother, Afonso V of Portugal, causing the War of Castilian Succession. Lasting from 1475-1479, it was a tense conflict over the succession of the crown between Joanna and Isabella.

In 1478, Isabella's army defeated Joanna in the Battle of Guinea. The war ended and the treaty of Alcáçovas-Toledo was signed. Meaning, Isabella and Ferdinand became sovereigns of Castile.

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