When King Louis XVIII's nephew, Charles Ferdinand, duc de Berry, was fatally stabbed on the night of 13 February 1820 in front of the former theatre of the Paris Opera, the Salle de la rue de Richelieu, the king decided that the theatre would be demolished in order to build a commemorative chapel in its place. However, the project to build a chapel was never carried out due to the 1830 revolution. Today the Fontaine Louvois in the Square Louvois occupies the spot where the chapel would have been built. The Salle de la rue de Richelieu had been the principal venue of the Paris Opera since 1794. Very soon after the death of his nephew in February 1820, the king commissioned the architect François Debret to design a new theatre for the Opéra on the Rue Le Peletier, which was completed one year later. During the construction the opera and ballet companies occupied the Théâtre Favart and the Salle Louvois.