Question: La sonnambula used themes from a Vincenzo Bellini opera that had a libretto by whom?

Context paragraphs:
L'Île Enchantée: L'Île Enchantée (literally, The Enchanted Island) is an 1864 ballet by Arthur Sullivan written as a divertissement at the end of Vincenzo Bellini's "La Sonnambula" at Covent Garden.  It was choreographed by H. Desplaces.

La somnambule, ou L'arrivée d'un nouveau seigneur: La somnambule is a ballet-pantomime composed by Ferdinand Hérold and premiered on 19 September 1827 at the Académie Royale de Musique.  The scenario was by Eugène Scribe, and it was choreographed by Jean-Pierre Aumer.  This ballet was produced in 1827 at the height of a fashion for stage works incorporating somnambulism.  The work was quite popular in Paris and inspired many more works incorporating somnambulism, including Vincenzo Bellini's well-known Italian opera "La sonnambula".

La sonnambula: La sonnambula ("The Sleepwalker") is an opera semiseria in two acts, with music in the "bel canto" tradition by Vincenzo Bellini set to an Italian libretto by Felice Romani, based on a scenario for a "ballet-pantomime" written by Eugène Scribe and choreographed by Jean-Pierre Aumer called "La somnambule, ou L'arrivée d'un nouveau seigneur".  The ballet had premiered in Paris in September 1827 at the height of a fashion for stage works incorporating somnambulism.

La sonnambula (Balanchine): La sonnambula "(The Sleepwalker)" is a ballet by the co-founder and ballet master of New York City Ballet, George Balanchine, made to Vittorio Rieti's music using themes from the operas of Vincenzo Bellini including "La Sonnambula", "Norma", "I Puritani" and "I Capuleti e i Montecchi" (1830–35) and with costumes by Karinska.  The premiere took place with the Ballet Russe de Monte Carlo on Wednesday, 27 February , at City Center of Music and Drama, New York; the City Ballet premiere was on 6 January 1965.

Tenore di grazia: Tenore di grazia , also called leggero tenor ("graceful" and "light" tenor, respectively), is a lightweight, flexible tenor voice type.  The tenor roles written in the early 19th-century Italian operas are invariably leggero tenor roles, especially those by Rossini such as Lindoro in "L'italiana in Algeri", Don Ramiro in "La Cenerentola", and Almaviva in "Il barbiere di Siviglia"; and those by Bellini such as Gualtiero in "Il pirata", Elvino in "La sonnambula" and Arturo in "I puritani".  Many Donizetti roles, such as Nemorino in "L'elisir d'amore" and Ernesto in "Don Pasquale", Tonio in "La fille du régiment", are also "tenore di grazia" roles.  One of the most famous leggero tenors of that period was Giovanni Battista Rubini, for whom Bellini wrote nearly all his operas.

CastaDiva: CastaDiva is a 5 star luxury resort located in Blevio in the province of Como, Italy.  The heart of the resort consists of the Roccabruna Villa, which was once the home of soprano Giuditta Pasta and where the composer Vincenzo Bellini wrote his two most famous works: La Sonnambula and Norma.

Princess's Theatre, London: The Princess's Theatre or Princess Theatre was a theatre in Oxford Street, London.  The building opened in 1828 as the "Queen's Bazaar" and housed a diorama by Clarkson Stanfield and David Roberts.  It was converted into a theatre and opened in 1836 as the Princess's Theatre, named for then Princess Victoria before her accession as queen.  After an unsuccessful series of promenade concerts, alterations were made on the interior, and the theatre was reopened on 26 December 1842 with Vincenzo Bellini's opera "La sonnambula".  The theatre, by now under the management of John Medex Maddox, presented operas and other entertainments, such as General Tom Thumb.

I Capuleti e i Montecchi: I Capuleti e i Montecchi ("The Capulets and the Montagues") is an Italian opera ("Tragedia lirica") in two acts by Vincenzo Bellini.  The libretto by Felice Romani was a reworking of the story of "Romeo and Juliet" for an opera by Nicola Vaccai called "Giulietta e Romeo" and based on the play of the same name by Luigi Scevola written in 1818, thus an Italian source rather than taken directly from William Shakespeare.

Catania–Fontanarossa Airport: Catania–Fontanarossa Airport (Italian: "aeroporto internazionale Vincenzo Bellini di Catania-Fontanarossa" , English: Catania International Airport) (IATA: CTA, ICAO: LICC) also named as Vincenzo Bellini Airport, is an international airport 2.3 NM southwest of Catania, the second largest city on the Italian island of Sicily.  It is named after the opera composer Vincenzo Bellini who was born in Catania.

La sonnambula (disambiguation): La sonnambula is an 1831 opera by Vincenzo Bellini with an Italian libretto by Felice Romani, based on a scenario by Eugène Scribe

Supporting paragraphs: La sonnambula (Balanchine) I Capuleti e i Montecchi
Answer: Felice Romani