Are both Eine florentinische Tragödie and Alceste operas?
Alceste (Gluck) Alceste, Wq. 37 (the later French version is Wq. 44), is an opera by Christoph Willibald Gluck from 1767. The libretto (in Italian) was written by Ranieri de' Calzabigi and based on the play "Alcestis" by Euripides. The premiere took place on 26 December 1767 at the Burgtheater in Vienna.
Oronthée Oronthée (or "Orontée") is a French-language opera by the composer Paolo Lorenzani, first performed by the singers and musicians of the Académie Royale de Musique (the Paris Opera) at Chantilly on 23 August 1688 as part of the celebrations the Prince of Condé gave for the Dauphin. It takes the form of a "tragédie en musique" in a prologue and five acts. Almost all of the score is lost.