Un Ballo in Maschera

Un ballo in maschera
Opera by Giuseppe Verdi
The final scene of the opera depicted on the piano/vocal score published in 1860
Translation	A Masked Ball
Librettist	Antonio Somma
Language	Italian
Based on	Eugène Scribe's libretto for Daniel Auber's 1833 Gustave III, ou Le bal masqué
Premiere	17 February 1859 (1859-02-17) Teatro Apollo, Rome

Un ballo in maschera (A Masked Ball) is an opera in three acts by Giuseppe Verdi with text by Antonio Somma. However, Somma's libretto was itself based on the five act libretto which playwright Eugène Scribe had written for Daniel Auber's 1833 opera, Gustave III, ou Le bal masqué.

Scribe wrote about the assassination in 1792 of King Gustav III of Sweden who was killed as the result of a political conspiracy against him. He was shot while attending a masked ballroom dance and died 13 days later of his wounds.

It was to take over two years between the time of the commission from Naples and planned for a production there and its premiere performance at the Teatro Apollo in Rome on 17 February 1859. In order to become the Un ballo in maschera which we know today, Verdi's opera (and his libretto) was forced to undergo a significant series of transformations and title changes. Based on the Scribe libretto and begun as Gustavo III set in Sweden, it became Una vendetta in dominò set in Germany, and finally Un ballo, set not in Sweden but in Boston, Massachusetts during the colonial era. These changes were caused by a combination of censorship regulations in both Naples and Rome, as well as by the political situation in France in January 1858. It became one of the most frustrating experiences of Verdi's career.

From the mid-20th century, it has become more common for the setting to revert to its original 18th-century Stockholm location. A re-creation of the original Gustavo III has been staged in Sweden.

A commission by the Teatro San Carlo in Naples in early 1857 led Verdi to begin to oversee the finalization of the libretto (also by Somma) for Re Lear with the aim of presenting the finished opera during the 1858 carnival season. When this proved to be impracticable, Verdi turned to the subject of King Gustav III's assassination as portrayed in Scribe and Auber's opera, albeit not an historically accurate narrative. That subject was well known and had been used by other composers, including Saverio Mercadante for his Il reggente in 1843.