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).
Gaetano Martinelli Gaetano Martinelli (? – 1802) was an Italian librettist active in the court theatres of Charles Eugene, Duke of Württemberg from 1766 to 1769 and in Lisbon as the court poet to Joseph I of Portugal and his daughter Maria I from 1769 until his death in 1802. He was one of a group of reforming Italian librettists which also included Calzabigi, Verazi, and Migliavacca, who moved away from the traditional Metastasian plot structures that had dominated opera during the first half of the 18th century. The majority of his early libretti were for comic ("opera buffa") or semi-comic ("dramma giocoso") operas.