In the years directly following this break with Richelieu, Corneille produced what is considered his finest play.
Le Cid ('
al sayyid' in Arabic; roughly translated as 'The Lord'), is based on the play
Mocedades del Cid (1621) by
Guillem de Castro. Both plays were based on the legend of
Rodrigo Díaz de Vivar (nicknamed
El Cid Campeador), a military figure in Medieval Spain.
The original 1637 edition of the play was subtitled a
tragicomedy, acknowledging that it intentionally defies the classical
tragedy/comedy distinction. Even though
Le Cid was an enormous popular success, it was the subject of a heated polemic over the norms of dramatic practice, known as the '
Querelle du Cid' or '
The Quarrel of Le Cid'. Cardinal Richelieu's
Académie Française acknowledged the play's success, but determined that it was defective, in part because it did not respect the
classical unities of time, place, and action (Unity of Time stipulated that all the action in a play must take place within a twenty-four hour time-frame; Unity of Place, that there must be only one setting for the action; and Unity of Action, that the plot must be centred around a single conflict or problem). The newly-formed
Académie was a body that asserted state control over cultural activity. Although it usually dealt with efforts to standardize the
French language, Richelieu himself ordered an analysis of
Le Cid.
Accusations of immorality were leveled at the play in the form of a famous pamphlet campaign. These attacks were founded on the classical theory that the theatre was a site of moral instruction. The Académie's recommendations concerning the play are articulated in
Jean Chapelain's Sentiments de l'Académie française sur la tragi-comédie du Cid (1638). Even the prominent writer
Georges de Scudéry harshly criticized the play in his
Observations sur le Cid (1637).
The controversy grew too much for Corneille, who decided to return to Rouen. When one of his plays was reviewed unfavorably, Corneille was known to withdraw from public life.