Elena da Feltre

Elena da Feltre is an opera in three acts by 19th century Italian composer Saverio Mercadante from a libretto by Salvatore Cammarano, well-known as librettist of Donizetti's Lucia di Lammermoor and Verdi's Il trovatore. The premiere took place at the Teatro San Carlo in Naples on 1 January 1839 as part of the Carnival Season. While not successful at the time, the opera was revived at La Scala in 1843 with twenty performances.
When composing Elena da Feltre in 1838, Mercadante wrote to Francesco Florimo laying out his ideas about how opera should be structured, following the "revolution" begun in his previous opera, Il giuramento: