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Afonso, Prince of Portugal, was born in 1475 as the only son and heir of King John. In 1490, Afonso was married to Isabella, the heir of Isabella I of Castille and Ferdinand II of Aragon.

The marriage of these two families created an interesting situation. If John, the only son of Ferdinand and Isabella, died without heir Afonso would be heir not only to the throne of Portugal but also to the thrones of Castile and Aragon. After realizing their mistake, Isabella and Ferdinand tried every diplomatic trick to annul the marriage.

Salvation came to the Catholic Monarchs in a mysterious accident, where Afonso was thrown from his horse and killed. The prince's death ended the threat to Castillian and Argonese independence. A later attempt to unify the three crowns under Manuel I of Portugal also failed.

So what if, Afonso had not been thrown from his horse and instead unified the three crowns into an Iberian Union?
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