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What does the title El Cid mean in Spanish Arabic?

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Cid, the — El Cid The Cid, sculpture in Balboa Park, San Diego.

The title El Cid is derived from the Spanish Arabic term al-sīd (or al-sayyid), which translates to "the lord". This popular name, which dates back to the lifetime of the Castilian military leader Rodrigo Díaz, served as a title of respect and authority.12