Question: What opera that starred William Martin was based on a play written by William Shakespeare?
Context: Just a Gigolo is a 1931 American Pre-Code is a romantic comedy film released by MGM.  It was directed by Jack Conway, produced by Irving Thalberg and starred William Haines, Irene Purcell, C. Aubrey Smith, and Ray Milland.  It was adapted from the 1930 play of the same name, which also starred Irene Purcell in the role of Roxana 'Roxy' Hartley.  The film features the song "Just a Gigolo". Roméo et Juliette ("Romeo and Juliet") is an opera in five acts by Charles Gounod to a French libretto by Jules Barbier and Michel Carré, based on "The Tragedy of Romeo and Juliet" by William Shakespeare.  It was first performed at the Théâtre Lyrique (Théâtre-Lyrique Impérial du Châtelet), Paris on 27 April 1867.  This opera is notable for the series of four duets for the main characters and the waltz song ""Je veux vivre"" for the soprano. Bulmer is a transitional serif typeface originally designed by William Martin (1757–1830) in 1792 for the Shakespeare Press.  The types were used for printing the Boydell Shakespeare folio edition. Double Falsehood (archaic spelling: Double Falshood) or The Distrest Lovers is an early 18th-century play by the English writer and playwright Lewis Theobald, although the authorship has been contested ever since the play was first published, with some scholars considering that it may have been written by John Fletcher and William Shakespeare.  Some authors believe that it may be an adaptation of a lost play by William Shakespeare and John Fletcher known as "Cardenio".  Theobald himself claimed his version was based on three manuscripts of an unnamed lost play by Shakespeare. Forgotten Sins was a 1996 television movie based on Lawrence Wright's "New Yorker" articles and his book "Remembering Satan", which was in turn based on the actual case of Paul Ingram.  It originally aired on the ABC Network on March 7, 1996.  It starred William Devane as Dr. Richard Ofshe, "a role to which William Devane brings his customary bristling panache" wrote Dorothy Rabinowitz in the Wall Street Journal.  John Shea also starred as Matthew Bradshaw, a fictional character based on Paul Ingram.  Bess Armstrong also appeared in this film, portraying Roberta 'Bobbie' Bradshaw, a character based on Sandy Ingram. " Doogie Howser"'s Lisa Dean Ryan co-starred. Pericles, Prince of Tyre is a Jacobean play written at least in part by William Shakespeare and included in modern editions of his collected works despite questions over its authorship, as it was not included in the First Folio.  Whilst various arguments support that Shakespeare is the sole author of the play (notably DelVecchio and Hammond's Cambridge edition of the play), modern editors generally agree that Shakespeare is responsible for almost exactly half the play—827 lines—the main portion after scene 9 that follows the story of Pericles and Marina.  Modern textual studies indicate that the first two acts of 835 lines detailing the many voyages of Pericles were written by a collaborator, which strong evidence suggests to have been the victualler, panderer, dramatist and pamphleteer George Wilkins. Long Gone is a 1987 baseball film by HBO that is based on Paul Hemphill's 1979 book of the same name.  The television film was directed by Martin Davidson and starred William Petersen, Virginia Madsen, and Dermot Mulroney.  Historic McKechnie Field, located in Bradenton, Florida, was the location for many of the film's scenes.  Outside North America, the film was released as "Stogies". A Naughty Knight is a 2001 musical comedy play written by William Martin with music and lyrics by Chuck Strand.  The play premiered at the Off-Off Broadway Duke Theatre in a production by the Jewish Repertory Theatre. Shylock is an award-winning monologue in one 80-minute act written by Canadian playwright Mark Leiren-Young.  It premiered at Bard on the Beach on August 5, 1996, where it was directed by John Juliani and starred popular Canadian radio host, David Berner.  Its American debut was in 1998 at Philadelphia’s Walnut Street Theatre where it was directed by Deborah Block, starred William Leach and was “Barrymore Recommended.”  It has since been produced at theatres, Shakespeare Festivals and Fringes throughout Canada and the US (including the San Diego Repertory Theatre where it was staged opposite a controversial production of "The Merchant of Venice"), was translated for a production in Denmark and has been staged twice by the original actor, Berner, in Venice. William Martin (born 13 April 1898 – ?)  was an American classical tenor.  Born in Massachusetts, he studied singing with Leveret Merrill, A Sujol, and Florence Holtzman.  A graduate of Harvard University, he was for many years a member of the Harvard Glee Club.  He made his professional opera debut in 1923 in the title role of Jules Massenet's "Werther".  He was committed to the Opéra-Comique in Paris from 1925-1929 where he notably sang the role of Philipp in the world premiere of Lucien Chevaillier's "Le poème du soir".  In 1927 he and Mary McCormic became the first two Americans to appear in leading roles at the Opéra National de Paris, respectively portraying the title role and the role of Marguerite in Charles Gounod's "Faust".  In 1929 he had a major success at the Palais Garnier as the Duke of Mantua in Giuseppe Verdi's "Rigoletto".  In 1930 he sang Romeo to Grace Moore's Juliette in Gounod's "Roméo et Juliette" at the Opéra Royal de Wallonie.  Martin is best remembered today for creating the role of Amelia's lover in the world premiere of Gian Carlo Menotti's "Amelia Goes to the Ball" on 1 April 1937 at the Philadelphia Academy of Music.
Answer: Roméo et Juliette