Isabella of Castile was a powerful queen who ruled from 1474 to 1504, known for her role in unifying Spain and sponsoring Christopher Columbus's 1492 expedition. She is often remembered for her marriage to Ferdinand II of Aragon, which created a dynastic union that laid the foundation for the modern Spanish state, as well as her efforts in the Catholic Reconquista that aimed to expel Muslim rulers from the Iberian Peninsula.
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