This is a 1689 copy of Girolamo Gigli's three-act libretto for the opera "La Fede ne' tradimenti," set to music by Giuseppe Fabbrini for the 1689 Carnival season at the Collegio Tolomei in Siena, Italy.

Libretto of the opera "Thetis et Pelée" by Bernard le Bovier de Fontenelle. In the plot, the Nereid Thetis is wooed by Jupiter and Neptune, as well as by a mortal, Pelée (Peleus). When a storm caused by Neptune disrupts a celebration Jupiter gave in honor of Thetis, an oracle is consulted, which foretells that Thetis's husband will one day be less powerful than his son. Neptune and Jupiter withdraw their claims, and Thetis marries Pelée. Pascal Collasse composed the music of the opera which premiered at the Paris Opéra on January 11, 1689. This copy includes an engraved frontispiece titled, "Thetis et Pelée" by Juan Dolivar (undersigned as J. Dolivart).