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
Mozart wrote two replacement arias for Susanna when the role was taken over by Adriana Ferrarese in the 1789 revival. The replacement arias, "Un moto di gioia" (replacing "Venite, inginocchiatevi" in act 2) and "Al desio di chi t'adora" (replacing "Deh vieni, non tardar" in act 4), in which the two clarinets are replaced with basset horns, are normally not used in modern performances. A notable exception was a series of performances at the Metropolitan Opera in 1998 with Cecilia Bartoli as Susanna.