Are both pieces The Immortal Hour and L'incoronazione di Poppea an opera?
The Immortal Hour The Immortal Hour is an opera by English composer Rutland Boughton. Boughton adapted his own libretto from the works of Fiona MacLeod, a pseudonym of writer William Sharp.
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.