Answer
"Les martyrs", an opera by Gaetano Donizetti, originated from his earlier work titled "Poliuto". Originally set in Armenia during the persecution of Christians, the composer revised the opera to suit the standards of the Paris Opéra, resulting in the creation of "Les martyrs". Donizetti made significant changes to the libretto, altering the setting to ancient Rome and changing the protagonist's name to Poliuto.