High Quality Content by WIKIPEDIA articles Un ballo in maschera (A Masked Ball), is an opera in three acts by Giuseppe Verdi with text by Antonio Somma. The libretto is loosely based on an 1833 play, Gustave III, by French playwright Eug ne Scribe who wrote about the historical assassination of King Gustav III of Sweden. The subject was well known and had been used by other composers, including Daniel Auber, for his 1833 opera, Gustave III, ou Le...