El Cid Campeador was the nickname of Rodrigo Díaz de Vivar, an 11th century Castilian nobleman and military leader who helped reclaim territory from Moorish rule and became a hero in Spanish literature and folklore. As a skilled warrior, he captured Valencia and established his own principality there while also serving Moorish kings for a time after being exiled from Castile; after his death, he and his wife Ximena were originally buried in Burgos but their remains now rest in the city's cathedral.