abstract: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 1675Most sources give the date of the premiere as 11 January, but the listing of performances of Thesée at césar gives the date as 12 January.