Are Norma and Idomeneo both operas by Bellini?
Idomeneo Idomeneo, re di Creta ossia Ilia e Idamante (Italian for "Idomeneus, King of Crete, or, Ilia and Idamante"; usually referred to simply as Idomeneo, K. 366) is an Italian language opera seria by Wolfgang Amadeus Mozart. The libretto was adapted by Giambattista Varesco from a French text by Antoine Danchet, which had been set to music by André Campra as "Idoménée" in 1712. Mozart and Varesco were commissioned in 1780 by Karl Theodor, Elector of Bavaria for a court carnival. He probably chose the subject, though it might have been Mozart. The work premiered on 29 January 1781 at the Cuvilliés Theatre in Munich, Germany.
Gloria (opera) Gloria is a tragic opera in three acts by Francesco Cilea with an Italian libretto by Arturo Colautti. A variation on the Romeo and Juliet story and set in 14th century Siena, the libretto is based on Victorien Sardou's 1874 play "La Haine" ("Hatred"). The opera premiered on 15 April 1907 at La Scala conducted by Arturo Toscanini with Salomea Krusceniski in the title role. "Gloria" was a failure at its premiere when it was withdrawn after two performances and fared little better in the 1932 revised version, although there have been two late 20th century revivals. It proved to be Cilea's last staged opera. In the 43 years following the premiere of "Gloria" he worked on two or three further operas which were never performed and continued to compose chamber and orchestral music.