The Marriage of Figaro (play)
The play formed the basis for an opera with a libretto by Lorenzo Da Ponte and music by Mozart, also called "The Marriage of Figaro" (1786). In 1799, another opera based on the same play, "La pazza giornata, ovvero Il matrimonio di Figaro", was produced in Venice with libretto by Gaetano Rossi and music by Marcos Portugal.
Die Liebe der Danae
Die Liebe der Danae ("The Love of Danae") is an opera in three acts by Richard Strauss to a February 1937 German libretto by Joseph Gregor, based on an outline written in 1920, "Danae, or The Marriage of Convenience", by Hugo von Hofmannsthal. Strauss worked on the score in 1937, 1938 and into 1939, although he was pre-occupied with completing "Daphne", developing ideas with Gregor and finally replacing him as librettist for "Capriccio", and then succumbed to illness, which caused postponement for several months into 1940. The opera was finally finished on 28 June 1940.