Droit du seigneur
In Mozart's "The Marriage of Figaro", which premiered in 1786 with a libretto by Lorenzo Da Ponte, the comic plot revolves around the successful efforts of the young bride and groom, Figaro and Susanna, to block the efforts of the unfaithful Count Almaviva to seduce Susanna. To achieve his aim, the frustrated Count threatens to reinstitute "droit du seigneur". It was based on a play by Pierre Beaumarchais.
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.