Question: Which composer is considered the founder of the Neapolitan school of opera: Gaetano Donizetti or Alessandro Scarlatti?
Context: Il trionfo dell'onore ("The Triumph of Honour") is an operatic 'commedia' in three acts by the Italian composer Alessandro Scarlatti, with a libretto by .  It was first performed at the Teatro dei Fiorentini, Naples on 26 November 1718.  It is Scarlatti's only known comic opera. Il Pompeo is a dramma per musica in three acts by composer Alessandro Scarlatti.  Written in 1682 when Scarlatti was 22 years old, it was his fourth opera and first dramatic work on a serious and grand subject.  The opera uses an Italian language libretto by Nicolò Minato which had previously been used by Francesco Cavalli for his 1666 opera "Pompeo Magno".  The work premiered at the Teatro di Palazzo Colonna in Rome on 25 January 1683. Griselda is an opera seria in three acts by the Italian composer Alessandro Scarlatti, the last of Scarlatti’s operas to survive completely today.  The libretto is by Apostolo Zeno, with revisions by an anonymous author.  Zeno wrote his work in 1701 and it had already been set by Pollarolo and Antonio Maria Bononcini (Albinoni, Giovanni Bononcini and Vivaldi would later produce versions).  It is based on the story of Patient Griselda from Boccaccio's "Decameron".  Scarlatti's opera was first performed at the Teatro Capranica, Rome in January, 1721 with an all-male cast (five castratos and a tenor). L'honestà negli amori is a dramma per musica in 3 acts by composer Alessandro Scarlatti.  Written in 1679-1680 when Scarlatti was 19 years old, it was his second opera.  The opera uses an Italian language libretto that was written by either D F Bernini or Domenico Filippo Contini.  The work premiered at the Teatro di Palazzo Bernini in Rome on 3 February 1680.  The opera was performed again in 1682 in Acquaviva delle Fonti at the Palazzo De Mari with "Acquaviva laureata" a serenata composed by Giovanni Cesare Netti. Tigrane, o vero L'egual impegno d'amore e di fede ("Tigranes or The Equal Ties of Love and Faith") is an opera seria in three acts by the Italian composer Alessandro Scarlatti with a libretto by Domenico Lalli (loosely based on the "Histories" of Herodotus).  It was first performed at the Teatro San Bartolomeo, Naples on 16 February 1715.  It is regarded as one of Scarlatti's finest operas.  As well as the serious main plot, there are also comic scenes involving the servants Dorilla and Orcone. Pietro Alessandro Gaspare Scarlatti (2 May 1660 – 22 October 1725) was an Italian Baroque composer, especially famous for his operas and chamber cantatas.  He is considered the founder of the Neapolitan school of opera.  He was the father of two other composers, Domenico Scarlatti and Pietro Filippo Scarlatti. In music history, the Neapolitan School is a group, associated with opera, of 18th-century composers who studied or worked in Naples, Italy, the best known of whom is Alessandro Scarlatti, with whom "modern opera begins". Il Mitridate Eupatore ("Mithridates Eupator") is an opera seria in five acts by the Italian composer Alessandro Scarlatti with a libretto by Girolamo Frigimelica Roberti.  It was first performed at the Teatro San Giovanni Grisostomo, Venice on 5 January, 1707.  A failure at its premiere, "Mitridate Eupatore" is now considered one of the finest of Scarlatti's operas. Alessandro Melani (4 February 1639 – 3 October 1703) was an Italian composer and the brother of composer Jacopo Melani, and castrato singer Atto Melani.  Along with Bernardo Pasquini and Alessandro Scarlatti, he was one of the leading composers active in Rome during the 17th century.  He is also ranked among the second school of Roman opera composers which began with his brother's 1668 opera "Il Girello".  He is chiefly remembered today for his large output of liturgical music that he wrote while serving in various musical posts in Rome.  Of particular interest is the large number of polychoral motets that he produced and his eight ascribed oratorios. Three published collections of his liturgical music survive today along with numerous solitary motets from other published volumes.  A number of original manuscripts also survive. Domenico Gaetano Maria Donizetti (] ; 29 November 1797 – 8 April 1848) was an Italian composer.  Along with Gioachino Rossini and Vincenzo Bellini, Donizetti was a leading composer of the "bel canto" opera style during the first half of the nineteenth century.  Donizetti's close association with the bel canto style was undoubtedly an influence on other composers such as Giuseppe Verdi (1813–1901).
Answer: Pietro Alessandro Gaspare Scarlatti