Audiobook The Cid, a Spanish Hero written by J. M. Gardner. The Cid, an Arab nickname meaning "the Lord", has been called the "most famous Spaniard of all time". Rodrigo Diaz de Vivar was a Castillan military and political leader in medieval Spain. He was an outstanding general, first leading the Spanish against the Moors in victorious battles, then working as a mercenary-general for whoever would require a war won.