In episode 1 of season 21 of the 5 Minute Biographies podcast, we explore the remarkable reign of Isabella I of Castile, whose marriage to Ferdinand II of Aragon helped create the foundations of a united Spain. From the final victory in the Reconquista to the launch of the Age of Exploration with Columbus's voyage, Isabella's rule reshaped both Spain and the wider world. We also look at the controversial policies of religious uniformity that continue to spark debate centuries later.

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• 5 Minute History
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