Caritea, regina di Spagna premiered at what opera house that in the 19th century, became the site of many famous operatic premieres at which the works of several of the four major bel canto era composers were performed?
La Fenice:  Especially in the 19th century, La Fenice became the site of many famous operatic premieres at which the works of several of the four major "bel canto" era composers—Rossini, Bellini, Donizetti, and Verdi were performed.
i don't know