Wikipedia
Thésée (Theseus) is a tragédie en musique, an early type of French opera, in a prologue and five acts with music by Jean-Baptiste Lully and a libretto by Philippe Quinault based on Ovid's Metamorphoses. It was first performed on 11 January 1675 by the Paris Opera for the royal court at the Château de Saint-Germain-en-Laye and was first performed in public in April at the Théâtre du Palais-Royal in Paris.
The plot centres around a love triangle: Egée wants to marry his ward, princess Églé, while the sorceress Médée wishes to marry the young warrior Thésée, but Thésée and Églé love each other. Médée attempts to force the lovers to renounce each other: first by using her magic to bring Églé to a place of torment, then by convincing Egée to have Thésée killed as a potential threat to his reign. But before Thésée can drink the poison he has been given, Egée realises that Thésée is his lost son. He then gives Églé to Thésée. Médée takes vengeance by destroying the festive setting, but the goddess Minerve undoes this.
Thésée (Theseus) is an opera by the French composer Jean-Joseph de Mondonville, first performed at Fontainebleau on 7 November 1765. It takes the form of a tragédie en musique in five acts. The opera is a new setting of a libretto by Philippe Quinault, originally set by Jean-Baptiste Lully in 1675. Mondonville's version was not a success and did not get to enjoy its public premiere at the Paris Opera until 13 January 1767, but audience rejected it calling for the restoration of Lully's original music. Mondonville's opera was withdrawn for good after its fourth performance.