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Ordoño I was the king of Asturias from 850 to 866. He was the son of King Ramiro I and expanded the kingdom's territory, pushing south towards the Duero River. Ordoño I also established numerous castles to defend against Muslim incursions, which contributed to the formation of the region known as Castile. He is considered a significant figure in the early history of the Reconquista, the Christian reconquest of the Iberian Peninsula from Muslim rule.12

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