Question: What is the name of the opera created by a composer of Italian and French opera in the early classical period?

Context paragraphs:
Christoph Willibald Gluck: Christoph Willibald (Ritter von) Gluck (] ; 2 July 1714 – 15 November 1787) was a composer of Italian and French opera in the early classical period.  Born in the Upper Palatinate (now part of Germany) and raised in Bohemia, he gained prominence at the Habsburg court at Vienna, where he brought about the practical reform of opera's dramaturgical practices that many intellectuals had been campaigning for over the years.  With a series of radical new works in the 1760s, among them "Orfeo ed Euridice" and "Alceste", he broke the stranglehold that Metastasian "opera seria" had enjoyed for much of the century.

Mannheim school: Mannheim school refers to both the orchestral techniques pioneered by the court orchestra of Mannheim in the latter half of the 18th century as well as the group of composers of the early classical period, who composed for the orchestra of Mannheim.  The father of the school is considered to be the Bohemian composer Johann Stamitz.  Besides him, two generations of composers wrote compositions for the orchestra, whose reputation was due to its excellent discipline and the individual skill of its players; their performance style included new dynamic elements, crescendos and diminuendos.  Composers of the Mannheim school played an important role in the development of the classical period's genres and of the classical symphony form.

Edition Güntersberg: Edition Güntersberg is a German publishing house of classical music, focused on compositions for the viola da gamba.  It was founded in Heidelberg in 1990 by Günter von Zadow and Leonore von Zadow-Reichling, who is a professional gambist.  In addition to works from Renaissance and Baroque, the company has published music from the early classical period, for both viola da gamba, for example by Carl Friedrich Abel and baryton, including works by Joseph Haydn.

Blond Kouros's Head of the Acropolis: The so-called Blond Kouros's Head of the Acropolis is the head of a lost marble statue of a young man (Kouros or Ephebe sculpture type) of ca 480 BC, in the Acropolis Museum in Athens, Greece The head and part of the pelvis were found in 1923 northeast of the museum site on the Acropolis of Athens.  It belongs to the late archaic or early classical period (Severe style).  The curly hair points more to the Archaic than the Classical period.

Dismas Hataš: Dismas Hataš (German: "Hattasch" ; 1 December 1724 - 13 October 1777) was a Bohemian composer and violinist of the early classical period.

Johann Gottlieb Goldberg: Johann Gottlieb Goldberg (baptized 14 March 1727 – 13 April 1756), also known as Johann Gollberg or Johann Goltberg, was a German virtuoso harpsichordist, organist, and composer of the late Baroque and early Classical period.  He is best known for lending his name, as the probable original performer, to the renowned "Goldberg Variations" of J.S. Bach.

Ancient monuments of Java: Hundreds of ancient stone religious monuments lie on the island of Java.  Known as "candi" in Indonesian, they date from the early classical period of Javanese civilisation, beginning in the first part of the 8th century CE and ending after 900 CE.  The majority were built between 780 CE and 860 CE, even though the civilisation that created them existed for many centuries.

Il re pastore (Gluck): Il re pastore ("The Shepherd King") is an opera by the composer Christoph Willibald Gluck.  It takes the form of a "dramma per musica" in three acts.  The Italian-language libretto is by Pietro Metastasio.  The opera premiered on 8 December 1756 at the Burgtheater, Vienna.

Simone Kermes: Simone Kermes (born 17 May 1970) is a German coloratura soprano, especially known for her virtuoso voice, suited to the opera seria genre of the Baroque and early Classical period.

Kritios Boy: The marble Kritios Boy or Kritian Boy belongs to the Early Classical period of ancient Greek sculpture.  It is the first statue from classical antiquity known to use contrapposto; Kenneth Clark called it "the first beautiful nude in art" It is possible, even likely, that earlier Bronze statues had used the technique, but if they did, they have not survived and Susan Woodford has speculated that the statue is a copy of a Bronze original.  The Kritios Boy is thus named because it is attributed, on slender evidence, to Kritios who worked together with Nesiotes (sculptors of "Harmodius and Aristogeiton") or their school, from around 480 BC.  As currently mounted, the statue is considerably smaller than life-size at c. 86 cm (3 ft 10 ins), including the supports that replace the missing feet.

Supporting paragraphs: Il re pastore (Gluck) Christoph Willibald Gluck
Answer: Il re pastore