Mr. Leoni as Carlos and Mrs. Isabella Mattocks as Louisa in 鈥楧uenna.'Isabella Mattocks (1746-1826); nee Hallam; played the original Louisa in Sheridan's comic opera 鈥楧uenna.'Leoni was a very popular Italian singer of the era; whose voice sounded 鈥榤ore like the tones of a fine oboe than those which proceed from the human pipe.' Handwritten note states that Leoni died in Jamaica in 1796.Copperplate engraving from 1777 by unknown artist.