Are Dafne and Dido and Aeneas both compositions made for the opera?
Dafne (Opitz-Schütz) Die Dafne (1627) to a libretto by Martin Opitz (which survives), and music by Heinrich Schütz (which is lost), has traditionally been regarded as the first German opera, though it has also been proposed more recently that it was in fact a spoken drama with inserted song and ballet numbers.
Dioclesian Dioclesian (The Prophetess: or, The History of Dioclesian) is a tragicomic semi-opera in five acts by Henry Purcell to a libretto by Thomas Betterton based on the play "The Prophetess", by John Fletcher and Philip Massinger, which in turn was based very loosely on the life of the Emperor Diocletian. It was premiered in late May 1690 at the Queen's Theatre, Dorset Garden. The play was first produced in 1622. [??] Choreography for the various dances was provided by Josias Priest, who worked with Purcell on several other semi-operas.