Marcella is a 1789 tragedy by the British writer William Hayley.Nicoll p.227
The original Drury Lane cast included John Philip Kemble as Hernandez, William Barrymore as Alonzo, John Whitfield as Lupercio, Robert Benson as Lopez, Richard Wroughton as Governor of Barcelona and Jane Powell as Marcella.Hogan p.1203
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.