"L'Ange de Nisida" is an opera by which of these composers?

"L'Ange de Nisida" (The Angel of Nisida) is an opera semiseria in four acts by Italian composer Gaetano Donizetti, from a French-language libretto by Alphonse Royer and Gustave Vaëz.

Parts of the libretto are considered analogous with the libretto for Giovanni Pacini's "Adelaide e Comingio", and the final scene is based on the François-Thomas-Marie de Baculard d'Arnaud play "Les Amants malheureux, ou le comte de Comminges". Donizetti worked on the opera in late 1839—its final page is dated 27 December 1839.

Because the subject matter involved the mistress of a Neapolitan king, and may thus have caused difficulties with the Italian censors, Donizetti decided that the opera should be presented in France. The theater company Donizetti contracted went bankrupt; the opera was reworked as "La favorite" in September 1840.

"L'Ange" finally received its premiere in its original form in 2018 in a concert performance at London's Royal Opera House.

Domenico Gaetano Maria Donizetti (29 November 1797 – 8 April 1848) was an Italian composer, best known for his almost 70 operas. Along with Gioachino Rossini and Vincenzo Bellini, he was a leading composer of the "bel canto" opera style during the first half of the nineteenth century and a probable influence on other composers such as Giuseppe Verdi.