Nabucco (] ; short for Nabucodonosor ] ~] , English Nebuchadnezzar) is an Italian-language opera in four acts composed in 1841 by Giuseppe Verdi to an Italian libretto by Temistocle Solera.
 The libretto is based on biblical books of Jeremiah and Daniel and the 1836 play by Auguste Anicet-Bourgeois and Francis Cornue, although Antonio Cortese's ballet adaptation of the play (with its necessary simplifications), given at La Scala in 1836, was a more important source for Solera than the play itself.
 Under its original name of "Nabucodonosor", the opera was first performed at La Scala in Milan on 9 March 1842.
Christian Van Horn (born 1978 in Rockville Centre, New York) is an American operatic bass-baritone and has appeared with many of the world's most prestigious opera companies, including San Francisco Opera, The Metropolitan Opera, Lyric Opera of Chicago, Bayerische Staatsoper, Teatro dell'Opera di Roma, Netherlands Opera, Salzburg Festival, Los Angeles Opera, The Grand Théâtre du Genève, and Canadian Opera Company.
 His roles include the title role in Le nozze di Figaro, the Four Villains in Les Contes d'Hoffmann, Mephistopheles in Faust, Zaccaria in Nabucco, Escamillo in Carmen, Raimondo in Lucia di Lammermoor, Banquo in Macbeth, Colline in La Bohème, and Claudio in Aggrippina.
 Van Horn has also appeared as a concert soloist with the Berlin Philharmonic, Chicago Symphony Orchestra, San Francisco Symphony.
 Melbourne Symphony Orchestra, and the Los Angeles Philharmonic among others.
Mitridate, re di Ponto ("Mithridates, King of Pontus"), K. 87 (74a), is an early opera seria in three acts by Wolfgang Amadeus Mozart.
 The libretto is by after Giuseppe Parini's Italian translation of Jean Racine's play "Mithridate".
The Teatro Regio Ducal (Italian, "Royal Ducal Theatre") was the opera house in Milan from 26 December 1717 until 25 February 1776, when it was burned down following a carnival gala.
 Many famous composers and their operas are associated with it, including the premieres of Mozart's "Ascanio in Alba", "Mitridate, re di Ponto", and "Lucio Silla".
 The opera house also saw the premiere of Maria Teresa Agnesi Pinottini's "Ciro in Armenia" in 1753; one of the earliest successfully received operas by a female composer.
 Variant forms such as "Regio-Ducal Teatro" and "Teatro Regio Ducale" are also seen.
Eugenio Cavallini (16 June 1806 — 11 April 1881) was an Italian conductor, composer, violinist, and violist.
 In 1833 he became first violinist of the orchestra at La Scala, a post he held through 1855.
 He also served as a conductor at La Scala, notably leading the world premieres of Gaetano Donizetti's "Lucrezia Borgia" (1833), Donizetti's "Gemma di Vergy" (1834), Donizetti's "Maria Stuarda" (1835), Saverio Mercadante's "Il giuramento" (1837), Mercadante's "Il bravo" (1839), Giuseppe Verdi's "Oberto" (1839), Verdi's "Un giorno di regno" (1840), Donizetti's "Maria Padilla" (1841), Verdi's "Nabucco" (1842), Verdi's "I Lombardi alla prima crociata" (1843), Verdi's "Giovanna d'Arco" (1845), Federico Ricci's "Estella di Murcia" (1846), and Domenico Ronzani's "Salvator Rosa" (1854).
David Serero (born 22 April 1981) is a French baritone opera singer, actor, producer and philanthropist.
 He has played more than 1,000 concerts worldwide, and has performed lead roles in opera, theater and musicals such as Shylock ("Merchant of Venice"), Othello ("Othello"), Nabucco ("Nabucco"), Don Quixote ("Man of La Mancha"), Escamillo ("Carmen"), Enrico ("Lucia di Lammermoor"), Amonasro ("Aida"), the title roles of Don Giovanni and Rigoletto and starred in more than 100 films and TV series.
 In 2017, David Serero is honored in the Who's Who America for outstanding achievement in the entertainment world and for his contribution for the betterment of contemporary society.
Nigel Levings is an Australian stage lighting designer.
 He has designed lights for over 400 productions.
 He works extensively on operas, and has designed a large portion of Opera Australia's repertoire.
 Some of his most significant works include operas such as "The Demon" at the Bregenz Festival and for Zurich Opera; "Billy Budd" for the Welsh National Opera, Opera Australia, Canadian Opera Company, and for the English National Opera; "Nabucco" for Opera Australia; "Wozzeck" for Opera Australia; "L'Orfeo" for Innsbrucker Festwochen der Alten Musik and the Berlin State Opera; "A Midsummer Night's Dream" for the 1994 Edinburgh Festival; "La Belle Vivette" for the English National Opera; "Simon Boccanegra" for the Royal Opera House, Washington National Opera, and Dallas Opera; "Falstaff" for Théâtre du Châtelet; "Idomeneo", "Turandot", and "The Barber of Seville" for the Houston Grand Opera; and "Queen of Spades" for the Dallas Opera.
Norine Burgess is a Canadian singer.
 She is a graduate of the University of Calgary and the University of Toronto’s Opera School, mezzo-soprano.
 She received additional training as a member of the Canadian Opera Company (COC) Ensemble where she appeared in Electra, Suor Angelica, Lulu and Der Rosenkavalier.
 Ms. Burgess also performed Le Nozze di Figaro(Cherubino), Ariadne auf Naxos (Dryad), La Traviata(Flora) and Die Zauberflöte (Second Lady) with the COC.
 Additional operatic successes include Le Nozze di Figaro (Cherubino) and Carmen (Mercedes) with the Vancouver Opera, Fenena in Nabucco with Manitoba Opera, Albert Herring (Nancy) with the Calgary Opera and many appearances with the Edmonton Opera.
Arsilda, regina di Ponto is a dramma per musica by Antonio Vivaldi.
 The opera was first performed at the Teatro Sant'Angelo in Venice on 27 or 28 October 1716.
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.

Question: Which Opera has more acts Nabucco or Mitridate, re di Ponto ?
Answer: Nabucco