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.
Michel Carré
He went to Paris in 1840 intending to become a painter but took up writing instead. He wrote verse and plays before turning to writing libretti. He wrote the text for Charles Gounod's "Mireille" (1864) on his own, and collaborated with Eugène Cormon on Bizet's "Les pêcheurs de perles". However, the majority of his libretti were completed in tandem with Jules Barbier, with whom he wrote the libretti for numerous operas, including Camille Saint-Saëns's "Le timbre d'argent" (libretto written in 1864, first performed in 1877), Gounod's "Faust" (1859), "Roméo et Juliette" (1867), and Offenbach's "Les contes d'Hoffmann" (1881). As with the other libretti by Barbier and himself, these were adaptations of existing literary masterworks.