El Cid from Arabic "the Master, my Lord"

Rodrigo Díaz de Vivar (AD. 1043 – July 10, 1099), known as El Cid Campeador, was a Castilian nobleman, military leader, and diplomat. Exiled from the court of the Spanish Emperor Alfonso VI of León and Castile, El Cid went on to command a Moorish force consisting of Muladis, Berbers, Arabs and Malians, under Yusuf al-Mu'taman ibn Hud, Moorish king of the northeast Al-Andalus city of Zaragoza, and his successor, Al-Mustain II.

After the Christian defeat at the Battle of Sagrajas, El Cid was recalled to service by Alfonso VI, and commanded a combined Christian and Moorish army, which he used to create his own fiefdom in the Moorish Mediterranean coastal city of Valencia.

Rodrigo Díaz was educated in the royal court of Castile and became the alférez, the chief general, of Alfonso VI, and his most valuable asset in the fight against the Moors.