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.
Fiesque
Fiesque ("The Genoese Conspiracy") is an opera by the French composer Édouard Lalo. The libretto, by Charles Beauquier, is based on Schiller's 1784 play, "Die Verschwörung des Fiesco zu Genua", an account of the conspiracy in 1547 led by Fiesque against the ruling Doria family.