Eventually, his work became out of style, and, as plays like Pertharite and The Golden Fleece, failed, he withdrew and translated The Imitation of Christ into French.
Of his theory of the "three unities" only the "unity of action" found a source in ancient drama.  Despite this, his entry into the "five authors" solidified his devotion to the form, as evidenced even by his early comedies, like The Palace Corridor, The Maidservant, and The Comic Illusion. Eventually, his work became out of style, and, as plays like Pertharite and The Golden Fleece, failed, he withdrew and translated The Imitation of Christ into French. FTP, identify this greatest of the French classical playwrights, the author of Medee, Horace, and El Cid.
Of his theory of the "three unities" only the "unity of action" found a source in ancient drama.  
Pierre Corneille