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.
Ezio (libretto) Ezio is an opera libretto by Metastasio, first officially set to music by Pietro Auletta and premièred in the Teatro delle Dame, Rome, on December 26, 1728; an unauthorized setting by Nicola Porpora had already been premièred a month earlier (November 20) in Venice.