Masaniello or The Dumb Girl of Portici
The opera is set in Naples in 1647 at the time of Masaniello's revolt against Spanish rule.
As Alfonso, the son of the Spanish viceroy, marries Elvire, a Spanish princess, he is denounced by Fenella, dumb girl, as her seducer.
At Portici, Masaniello, Fenella's brother, gives the signal for insurrection.
They take the rebellion to Naples.
In their flight Alfonso and Elvire are unknowingly sheltered by Masaniello himself.
Masaniello is eventually killed after saving his royal guests. At the final curtain Fenella leaps into the crater of Vesuvius.