El Cid (died ~ Rodrigo Díaz de Vivar was a Castilian nobleman and military leader in medieval Spain. He was called El Cid by the Moors and El Campeador by Christians. He is the otherwise real but made legendary national hero of Castile.
Rodrigo Díaz de Vivar, Ruy Díaz de Vivar (also spelled Bivar), and El Campeador ("the Champion"). His title of "the Cid" comes from a Spanish dialect of Arabic, sidi, meaning "sir" or "lord," and was a title he acquired during his lifetime.