Question: Which composer is older, Jacques Offenbach or Gaspare Spontini?

Context articles: Milton (opera)
Maiolati Spontini
List of operas by Gaspare Spontini
Jacques Offenbach
Gaspare Spontini
Agnes von Hohenstaufen
Ludwig Rellstab
La vestale
Olimpie
Fernand Cortez

Milton is an opéra comique in one act by Gaspare Spontini.
 The French libretto, by Victor-Joseph Étienne de Jouy and Armand-Michel Dieulafoy, is based on the life of the English poet John Milton.
 "Milton" was first performed on 27 November 1804 by the Opéra-Comique at the Salle Feydeau in Paris .
 It was Spontini's first major success in France.
 The composer planned a reworked version for performances in Germany, under the title "Das verlorene Paradies" ("Paradise Lost"), but in the event it was never staged.
Maiolati Spontini is a "comune" (municipality) in the Province of Ancona in the Italian region Marche, located about 35 km southwest of Ancona.
 It is the birthplace of musician Gaspare Spontini, whose name has been conjoined with the commune's ancient name, Maiolati.
Gaspare Spontini (1774–1851) wrote operas from the last decade of the 18th century to the third decade of the 19th century.
Jacques Offenbach (] ; ] ; 20 June 1819 – 5 October 1880) was a German-born French composer, cellist and impresario of the romantic period.
 He is remembered for his nearly 100 operettas of the 1850s–1870s and his uncompleted opera "The Tales of Hoffmann".
 He was a powerful influence on later composers of the operetta genre, particularly Johann Strauss, Jr. and Arthur Sullivan.
 His best-known works were continually revived during the 20th century, and many of his operettas continue to be staged in the 21st.
 "The Tales of Hoffman" remains part of the standard opera repertory.
Gaspare Luigi Pacifico Spontini (14 November 177424 January 1851) was an Italian opera composer and conductor.
Agnes von Hohenstaufen is an opera in three acts by the Italian composer Gaspare Spontini.
 The German libretto is by Ernst Benjamin Salomo Raupach.
 It was first staged at the Königliches Opernhaus, Berlin, on 12 June 1829.
 Raupach categorised "Agnes von Hohenstaufen" as a "historical-romantic" opera and it is one of a number of German works of the time set in the Middle Ages (others include Weber's "Euryanthe", Wagner's "Tannhäuser" and "Lohengrin" and Schumann's "Genoveva").
 "Agnes" also contains many of the features that would be characteristic of French Grand Opera.
 Spontini substantially reworked the piece for a revival in 1837.
Heinrich Friedrich Ludwig Rellstab (13 April 179927 November 1860) was a German poet and music critic.
 He was born and died in Berlin.
 He was the son of the music publisher and composer Johann Carl Friedrich Rellstab.
 An able pianist, he published articles in various periodicals, including the influential liberal "Vossische Zeitung", and launched the music journal "Iris im Gebiete der Tonkunst", which was published in Berlin from 1830 to 1841.
 His outspoken criticism of the influence in Berlin of Gaspare Spontini landed him in jail in 1837.
La vestale ("The Vestal Virgin") is an opera composed by Gaspare Spontini to a French libretto by Étienne de Jouy.
 It takes the form of a "tragédie lyrique" in three acts.
 It was first performed on 15 December 1807 by the Académie Impériale de Musique (Paris Opera) at the Salle Montansier, and is regarded as Spontini's masterpiece.
 The musical style shows the influence of Gluck and looks forwards to the works of Berlioz, Wagner and French Grand Opera.
Olimpie (also spelled Olympie) is an opera in three acts by Gaspare Spontini.
 The French libretto, by Armand-Michel Dieulafoy and Charles Brifaut (1781–1857), is based on the play of the same name by Voltaire (1761).
 "Olimpie" was first performed on 22 December 1819 by the Paris Opéra at the Salle Montansier.
 When sung in Italian or German, it is usually given the title Olimpia.
Fernand Cortez, ou La conquête du Mexique ("Hernán Cortés, or The Conquest of Mexico") is an opéra in three acts by Gaspare Spontini with a French libretto by Etienne de Jouy and Joseph-Alphonse d’Esmenard.
 It was first performed on 28 November 1809 by the Académie Impériale de Musique (Paris Opera) at the Salle Montansier.