Romilda Pantaleoni is associated with her roles of La Gioconda and Margherita in what opera
La Gioconda (opera) La Gioconda is an opera in four acts by Amilcare Ponchielli set to an Italian libretto by Arrigo Boito (as Tobia Gorrio), based on "Angelo, Tyrant of Padua", a play in prose by Victor Hugo, dating from 1835. (This is the same source as Gaetano Rossi had used for his libretto for Mercadante's "Il giuramento" in 1837).
La lettera anonima La lettera anonima ("The anonymous letter") is a farce in one act composed by Gaetano Donizetti in 1822 to a libretto by Giulio Genoino, a former monk and the official censor of the Kingdom of the Two Sicilies. Genoino based his libretto on his own farce which, in turn, had been based on "Mélite, ou Les fausses lettres " by Pierre Corneille in 1630.