He never wrote an opera.
Wolfgang Amadeus Mozart wrote the music for the opera Così fan tutte.
Mozart
Andrew Lloyd Webber wrote this modern opera.
Gaston Leroux wrote the original book of Phantom of the Opera, but it was later made into a film/play by Andrew Lloyd Webber, who also wrote the music for it.
The opera Mefistofele was written by the Italian composer Arrigo Boito.
Ferdinand Herold
Pyotr Tchaikovsky
josplin
Giancarlo Menotti.
The Tender Land He also wrote an opera for performance in schools titled "Let's Make an Opera."
The Italian seria (drama) opera in two acts 'Idomeneo'.