Rodrigo Díaz de Vivar, universally known as El Cid, was a legendary 11th-century Castilian military leader and frontier lord who became an iconic folk hero of the Spanish Reconquista. Renowned for his brilliant tactical genius, he fought successfully for both Christian and Muslim rulers, navigating the complex, fragmented political landscape of medieval Iberia. His crowning achievement was the independent conquest and rule of the wealthy kingdom of Valencia, a feat that transformed his real-life exploits into enduring chivalric myth immortalized in epic poetry.

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