Despite the popularity of Corneille’s Le Cid, there are some who would claim the credit for this play’s greatness is not due to Corneille at all. Shortly after its first performance, at the Théâtre du Marais in Paris in 1637, Le Cid prompted an accusation of plagiarism. This French play seemed to be more than an adaptation of the Arabic and Christian legends about a great Spanish warrior known as ‘El Campeador’ (The Champion) and ‘Le Cid’ (The Lord). Rather, it was almost identical to Guillén de Castro's 1612 play Las Mocedades del Cid.
That was not the only thing which Le Cid was criticised
Le Cid guide sections