The Influence of Queen Isabella I in the Creation of Spain
TLDR Queen Isabella I of Castile played a major role in the creation of Spain by marrying Ferdinand, consolidating power, establishing the Santa Hermandad and Spanish Inquisition, completing the Reconquista, and funding Columbus's expedition, which led to the creation of the Spanish Empire. Her decision to merge the kingdoms of Castile and Leon with Aragon and Navarre ultimately created the modern country of Spain.
Timestamped Summary
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Queen Isabella I of Castile was a powerful and influential queen who played a major role in the creation of Spain.
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At the time of her birth, Spain was not yet a unified country and Isabella faced many obstacles to assuming the throne of Castile.
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Isabella had a strong education and paid close attention to political matters, and after her brother's death, she agreed to recognize Henry as long as she could choose her own husband.
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Isabella married Ferdinand, her original betrothed, and they eloped to avoid being married off to someone else, and after Henry's death, Isabella became the Queen of Castile and Lyon, and together with Ferdinand, they worked to consolidate power and unify the Iberian peninsula.
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Isabella created the Santa Hermandad to keep the nobility in check, established the Spanish Inquisition to use Catholicism as a unifying force, completed the Reconquista in 1492, and funded Columbus's expedition.
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Isabella's committee concluded that Columbus's calculations were off, but decided to finance his expedition anyway, resulting in the creation of the Spanish Empire and eventually the largest empire in the world.
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Isabella's choice to merge the kingdoms of Castile and Leon with Aragon and Navarre was the singular decision that created the modern country of Spain.