El Cid, born Rodrigo Díaz de Vivar around 1043 in Vivar, near Burgos, Spain, is one of the most celebrated figures in Spanish history. Known as both a revered hero and a skilled military leader, El Cid's life and legacy have been immortalized in legend and literature, most notably in the epic poem "El Cantar de Mio Cid."

Rodrigo Díaz was born into a noble Castilian family and rose to prominence as a knight under King Ferdinand I of León and Castile. His nickname, "El Cid," is derived from the Arabic title "Al-Sayyid," meaning "The Lord," reflecting the respect he commanded from both Christian and Muslim soldiers. His military prowess became evident as he fought in various campaigns, earning the trust of King Sancho II of Castile, under whom he served as a chief general.

El Cid's career, however, was marked by both triumphs and conflicts. After King Sancho's assassination, Rodrigo found himself at odds with King Alfonso VI, Sancho's brother and successor. This led to his temporary exile, during which El Cid offered his military services as a mercenary to various Muslim and Christian rulers, further enhancing his reputation as a formidable and independent warrior.

His most famous achievements came during his later years, when he captured the city of Valencia in 1094, ruling it as an independent lord until his death in 1099. El Cid's governance of Valencia was marked by a degree of tolerance and cooperation between Christians and Muslims, a reflection of the complex and multicultural society of medieval Spain.

El Cid's legacy endures as a symbol of Spanish chivalry, honor, and military skill. His life has inspired countless works of art, literature, and folklore, making him a national icon whose influence resonates even centuries after his death.