The Song of the Cid is essentially the oldest Castilian epic poem that has endured. The protagonist of the story is the Castilian hero El Cid, whose narrative is set in the time of the reconquest of Spain and is considered one of the most popular works in the medieval tradition. The original title of the work is El Cantar de Mio Cid.
This work revolves around the fact that El Cid has wed the cousin of King Alfonso VI, but is forced to leave his home country of Castile. It starts with the exile of El Cid and leads on to his story as he wishes to regain his honour by participating in battles. He is ultimately able to achieve renown and regain the favour of the king.