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How did Zaragoza become a tributary of Castile?
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El Cid
The Cid, sculpture in Balboa Park, San Diego.
Zaragoza became a tributary of the Castilian crown in 1067 during a military campaign led by Sancho II of Castile. El Cid, who was then a young commander of the royal troops, played a leading role in the negotiations that successfully established the Moorish king al-Muqtadir as a tributary to the Castilian throne.1