Are Euridice and Les pêcheurs de perlesboth operas?
Euridice (Peri) Euridice (also Erudice or Eurydice) is an opera by Jacopo Peri, with additional music by Giulio Caccini. It is the earliest surviving opera, Peri's earlier "Dafne" being lost. (Caccini wrote his own "Euridice" even as he supplied music to Peri's opera, published this version before Peri's was performed, in 1600, and got it staged two years later.) The libretto by Ottavio Rinuccini is based on books X and XI of Ovid's "Metamorphoses"
La toison d'or (opera) La toison d'or ("The Golden Fleece") is a French-language opera in three acts by the composer Johann Christoph Vogel, first performed at the Académie Royale de Musique (the Paris Opera) on 5 September 1786. The libretto, by Philippe Desriaux, is based on the legend of Jason and the Golden Fleece.