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.
The Marriage of Figaro
The opera was the first of three collaborations between Mozart and Da Ponte; their later collaborations were "Don Giovanni" and "Così fan tutte". It was Mozart who originally selected Beaumarchais's play and brought it to Da Ponte, who turned it into a libretto in six weeks, rewriting it in poetic Italian and removing all of the original's political references. In particular, Da Ponte replaced Figaro's climactic speech against inherited nobility with an equally angry aria against unfaithful wives. Contrary to the popular myth, the libretto was approved by the Emperor before any music was written by Mozart.