The Conspiracy is a 1796 tragedy by the Irish writer Robert Jephson.Nicoll p.277
The original cast included John Palmer as Roman emperor Titus, John Philip Kemble as Sextus, William Barrymore as Annius, Charles Kemble as Publius, Thomas Caulfield as Lentulus, Jane Powell as Cornelia and Sarah Siddons as Vitellia.Hogan p.1914
References
Bibliography Nicoll, Allardyce. A History of English Drama 1660–1900: Volume III. Cambridge University Press, 2009. Hogan, C.B (ed.) The London Stage, 1660–1800: Volume V. Southern Illinois University Press, 1968.