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.
Elena da Feltre Elena da Feltre is an opera in three acts by 19th-century Italian composer Saverio Mercadante from a libretto by Salvatore Cammarano, well known as librettist of Donizetti's "Lucia di Lammermoor" and Verdi's "Il trovatore". The premiere took place at the Teatro San Carlo in Naples on 1 January 1839 as part of the Carnival Season. While not successful at the time, the opera was revived at La Scala in 1843 with twenty performances.