Ivanhoé is an 1826 pastiche opera in three acts with music by Gioachino Rossini to a French-language libretto by Émile Deschamps and Gabriel-Gustave de Wailly, after Walter Scott's novel of the same name.
 The music was adapted, with the composer's permission, by the music-publisher Antonio Pacini from Rossini's operas, namely "Semiramide", "La Cenerentola", "La gazza ladra", and "Tancredi" in order to introduce his music to Paris.
 An examination of the score shows that Pacini also used music from "Bianca e Faliero", "Armida", "Maometto II", "Aureliano in Palmira", "Sigismondo", "Torvaldo e Dorliska", "Mosè in Egitto" and an amount of newly composed music including fanfares and the gallop that was later to become famous from its inclusion in "Guglielmo Tell".
 The work was premiered on 15 September 1826, at the Odéon Theatre.
La ladra (French: "Les anges aux mains noires" ) is a 1955 Italian-French crime-melodrama film co-written and directed by Mario Bonnard and starring Lise Bourdin and Fausto Tozzi.
The Turandot Suite, Op.
 41 (BV 248) is an orchestral work by Ferruccio Busoni written in 1904-5, based on Carlo Gozzi's play "Turandot".
 The music – in one form or another – occupied Busoni at various times between the years 1904–17.
 Busoni arranged the suite from incidental music which he was composing to accompany a production of Gozzi's play.
 The suite was first performed in October 1905, while the play with his incidental music was not produced until 1911.
 In August 1916 Busoni had finished composing the one-act opera "Arlecchino", but it needed a companion work to provide a full evening's entertainment.
 He suddenly decided to transform the "Turandot" music into a two-act opera with spoken dialog.
 The two works were premiered together as a double-bill in May 1917.
Turandot is a 1917 opera with spoken dialogue and in two acts by Ferruccio Busoni.
 Busoni prepared his own libretto, in German, based on the play by Count Carlo Gozzi.
 The music for Busoni's opera is based on the incidental music, and the associated "Turandot Suite" (BV 248), which Busoni had written in 1905 for a production of Gozzi's play.
 The opera is often performed as part of a double bill with Busoni's earlier one-act opera "Arlecchino".
La gazza ladra (] , The Thieving Magpie) is a "melodramma" or opera semiseria in two acts by Gioachino Rossini, with a libretto by Giovanni Gherardini based on "La pie voleuse" by Théodore Baudouin d'Aubigny and Louis-Charles Caigniez.
Arlecchino, "oder Die Fenster" ("Harlequin, or The Windows", is a one-act opera with spoken dialog by Ferruccio Busoni, with a libretto in German, composed in 1913.
 He completed the music for the opera while living in Zurich in 1916.
 It is a number opera written in neo-classical style and includes ironic allusions to operatic conventions and situations typical of the late 18th and early 19th centuries.
 It even includes a parody of a duel.
Teresa the Thief (Italian: "Teresa la ladra" ) is a 1973 commedia all'italiana film directed by Carlo Di Palma.
 It is based on the novel "Memorie di una ladra" written by Dacia Maraini in 1972.
La ladra is a 2010 Italian television series broadcast on Rai 1.
Emanuele Luzzati (3 June 1921 – 26 January 2007) was an Italian painter, production designer, illustrator, film director and animator.
 He was nominated for Academy Awards for two of his short films, "La gazza ladra" ("The Thieving Magpie") (1965) and "Pulcinella" (1973).
The Thieving Magpie (La Gazza Ladra) is a double live album by the British neo-progressive rock band Marillion.
 It was named after the introductory piece of classical music the band used before coming on stage during the "Clutching at Straws" tour 1987–1988, the overture to Rossini's opera "La gazza ladra", which translates as "The Thieving Magpie".

Question: Which opera has more acts, Arlecchino or La gazza ladra?
Answer: La gazza ladra