The theatrical monopoly first bestowed by Royal Letters Patent 183 years earlier was abolished by the Theatres Act 1843, but the patent had been largely toothless for decades and this had little immediate effect. On the other hand, other theatres, used to presenting musical entertainments, continued to do so, and Drury Lane continued as one of the most accepted venues for legitimate theatre. The 19th-century run of financial and artistic failures at Drury Lane was interrupted by four plays produced over a twenty-five-year period by the actor-playwright Dion Boucicault: "The Queen of Spades" (1851), "Eugenie" (1855), "Formosa" (1869), and "The Shaughraun" (1875). But this period of general decline culminated with F. B. Chatterton's 1878 resignation; in his words, "Shakespeare spells ruin, and Byron bankruptcy." During the 19th century, Drury Lane staged ballet as well, with performers including Italy's Carlotta Grisi.