Question: The Duchess of Malfi is an opera by the composer of what nationality?

Context paragraphs:
Antonio Beccadelli di Bologna: Antonio Beccadelli of Bologna (c.1475-1513) was an Italian aristocrat, whose tragic love affair and secret marriage with Giovanna d'Aragona, Duchess of Amalfi, inspired several works of literature, most notably John Webster's "The Duchess of Malfi" and Lope de Vega's "El mayordomo de la Duquesa Amalfi".

The Duchess of Malfi: The Duchess of Malfi (originally published as The Tragedy of the Dutchesse of Malfy) is a macabre, tragic play written by the English dramatist John Webster in 1612–13.  It was first performed privately at the Blackfriars Theatre, then later to a larger audience at The Globe, in 1613–14.

Emily Jewell: Emily Jewell is an English actress.  She trained at the Central School of Speech and Drama.  Jewell has appeared in "Look Back in Anger" (as Alison) and "The Duchess of Malfi" (as the Duchess) at the Twister Theatre Company.  She also appeared in the film "The Duchess".

The Duchess of Malfi (opera): The Duchess of Malfi is an opera in three acts by the British composer Stephen Oliver, based on the eponymous play by John Webster.  Oliver originally wrote this opera, his ninth in 1971, at age 21, for a production at the Oxford Playhouse on commission from the Oxford University Opera Club.  The premiere was on November 23, 1971, with the following cast members:

Appius and Virginia: Appius and Virginia is an early 17th-century stage play, a tragedy by John Webster (and perhaps Thomas Heywood).  It is the third and least famous of his tragedies, after "The White Devil" and "The Duchess of Malfi".

The Duchess of Malfi (disambiguation): The Duchess of Malfi is a macabre, tragic play, written by the English dramatist John Webster and first performed in 1614.

The Duchess of Malfi (Brecht): The Duchess of Malfi is an adaptation by the twentieth-century German dramatist Bertolt Brecht of the English seventeenth-century tragedy by John Webster.  He collaborated with H. R. Hays and Anglo American poet, W. H. Auden.  It was written during Brecht's period of exile in the United States.  In premiered in New York, in 1946.

The Skull Beneath the Skin: The Skull Beneath The Skin is a 1982 detective novel by P. D. James, featuring her female private detective Cordelia Gray.  The novel is set in a reconstructed Victorian castle on the fictional Courcy Island on the Dorset coast and centers around actress Clarissa Lisle who is to play John Webster's drama "The Duchess of Malfi" in the castle's restored theatre.  It takes its title from T. S. Eliot's poem "Whispers of Immortality", where Webster is famously said to be ""much possessed by death"" and to see ""the skull beneath the skin"".

Stephen Oliver (composer): Stephen Michael Harding Oliver (10 March 1950 – 29 April 1992) was an English composer, best known for his operas.

Giovanna d'Aragona, Duchess of Amalfi: Giovanna d'Aragona, Duchess of Amalfi (1478–1510) was an Italian aristocrat, regent of the Duchy of Amalfi during the minority of her son from 1498 until 1510.  Her tragic life inspired several works of literature, most notably John Webster's play, "The Duchess of Malfi".

Supporting paragraphs: The Duchess of Malfi (opera) Stephen Oliver (composer)
Answer: English