Maria Callas, Commendatore OMRI (Greek: Μαρία Κάλλας ; December 2, 1923 – September 16, 1977), was a Greek-American soprano, and one of the most renowned and influential opera singers of the 20th century.
 Many critics praised her "bel canto" technique, wide-ranging voice and dramatic interpretations.
 Her repertoire ranged from classical "opera seria" to the "bel canto" operas of Donizetti, Bellini and Rossini and further, to the works of Verdi and Puccini; and, in her early career, to the music dramas of Wagner.
 Her musical and dramatic talents led to her being hailed as "La Divina".
Flora Perini (20 November 1887 – September 1975) was an Italian operatic mezzo-soprano who had a prominent opera career in Europe, South America, and the United States during the first half of the twentieth century.
 She sang a wide repertoire that encompassed works by verisimo composers like Mascagni, bel canto composers like Rossini and Bellini, the Italian grand operas of Verdi, the German operas of Strauss and Wagner, and the Russian operas of Rimsky-Korsakov.
 She sang in numerous premieres throughout her career, including creating the role of the Princess in the original 1918 production of Puccini's "Suor Angelica".
Francesco Meli (born 1980 in Genoa) is an Italian operatic tenor particularly associated with the bel canto repertoire.
 He began his vocal studies at age 17 with Norma Palacios at the Conservatorio di Musica "Niccolò Paganini" in Genoa.
 He later became a pupil of mezzo-soprano Franca Mattiucci.
 In 2002 he debuted in Verdi's "Macbeth" and as the tenor soloist in Rossini's "Petite Messe Solennelle" and Puccini's "Messa di Gloria", broadcast by RAI (the Italian state broadcasting company) from the Festival dei Due Mondi in Spoleto.
 He has gone on to sing leading roles in La Scala, The Metropolitan Opera, Teatro Regio di Torino, London's Royal Opera House, Opéra National de Lyon, Zurich Opera, and the Rossini Opera Festival in Pesaro.
 In 2017, he will make his debut as Verdi's Don Carlo at La Scala and as Radames in Salzburg next to Anna Netrebko's Aida.
Opera Rara is a British non-profit recording company, founded in the early 1970s by American Patric Schmid and Englishman Don White to promote concerts of rare and/or forgotten operas by "bel canto" era composers such as Italian composers Gaetano Donizetti, Giovanni Pacini, Saverio Mercadante, and Federico Ricci, as well as French composers of the 1830s forward such as Giacomo Meyerbeer.
Caritea, regina di Spagna, ossia La morte di Don Alfonso re di Portogallo ("Caritea, Queen of Spain, or, The Death of Don Alfonso, King of Portugal"), is an opera in two acts by Saverio Mercadante, with a libretto by Paolo Pola.
 It was premiered at Teatro La Fenice in Venice on 21 February 1826.
William Vennard (31 January 1909 Normal, Illinois – 10 January 1971 Los Angeles, California) was a famous American vocal pedagogist who devoted his life to researching the human voice and its use in singing.
 He was one of the driving forces behind a major shift within the field of vocal pedagogy during the middle of the 20th century.
 Along with a few other American singing teachers, such as Ralph Appelman at Indiana University, Vennard introduced contemporary scientific research in the areas of human anatomy and physiology into the study of singing.
 This shift in approach led to the rejection of many of the beliefs and practices held since the bel canto era, most particularly in the areas of vocal registration and vocal resonation.
 Vennard was renowned as an excellent teacher whose written works have influenced generations of singers, vocal pedagogues and voice scientists.
 He taught many successful singers including acclaimed mezzo-soprano Marilyn Horne, who studied under him at the University of Southern California.
Teatro La Fenice (] , "The Phoenix") is an opera house in Venice, Italy.
 It is one of "the most famous and renowned landmarks in the history of Italian theatre", and in the history of opera as a whole.
 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.
Gaetano Rossi (18 May 1774 – 25 January 1855) was an Italian opera librettist for several of the well-known "bel canto"-era composers including Gioachino Rossini, Gaetano Donizetti, and Saverio Mercadante in Italy and Giacomo Meyerbeer in one of his early Italian successes.
 Other composers with whom he worked included Simon Mayr, a composer and Donizetti's teacher, as well as the prolific Giovanni Pacini.
Antonio Magini-Coletti (17 February 1855 – 21 July 1912) was a leading Italian baritone who had a prolific career in Europe and the United States during the late 19th century and the early part of the 20th century.
 A versatile artist, he appeared in several opera world premieres but was particularly associated with the works of Giuseppe Verdi, Richard Wagner and the verismo composers.
 He was also an accomplished exponent of the bel canto repertoire.
The Giorgio de Chirico House Museum ("Casa Museo di Giorgio de Chirico") is a house museum in the 16th century Palazzetto del Borgognoni at Piazza di Spagna 31 in Rome.
 The house was acquired by Giorgio de Chirico in 1948.
 It was left to the state by his widow and opened as a museum in 1998.
 Only open by appointment, it is closed on Mondays and Sundays.
 The nearest Metro stop is Spagna.

Question: 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?
Answer: Teatro La Fenice