Question: Stefan Janski is an opera director, he received significant acclaim for his production of which of Handel's opera seria in three acts, first performed in London on 15 April 1738?

Stefan Janski is an opera director.  He was the co-producer and librettist for the Sadler’s Wells Theatre production of "The Snowman of Kashmir" in 1974, and has served as Associate Director with Glyndebourne Festival Opera and its Touring Opera, as well as staff director for English National Opera.  He received significant acclaim for his production of Handel's "Xerxes".  He is Director of Opera Studies at the Royal Northern College of Music, which he joined in 1986.  He has also worked freelance for notable companies such as Scottish Opera, Los Angeles Opera and the Royal Ballet of Flanders. <SEP> Imeneo (alternative title: Hymen, HWV 41) is an opera seria in three acts by George Frideric Handel.  The Italian-language libretto was adapted from Silvio Stampiglia's "Imeneo".  Handel had begun composition in September 1738, but did not complete the score until 1740.  The opera received its first performance at the Lincoln's Inn Fields in London on 22 November 1740, and received another performance on 13 December.  Handel then revised the score, and this revised version received concert performances in Dublin, on 24 and 31 March 1742. <SEP> Serse (] ; English title: "Xerxes"; HWV 40) is an opera seria in three acts by George Frideric Handel.  It was first performed in London on 15 April 1738.  The Italian libretto was adapted by an unknown hand from that by Silvio Stampiglia for an earlier opera of the same name by Giovanni Bononcini in 1694.  Stampiglia's libretto was itself based on one by Nicolò Minato that was set by Francesco Cavalli in 1654.  The opera is set in Persia (modern-day Iran) in 480 BC and is very loosely based upon Xerxes I of Persia, though there is little in either the libretto or music that is relevant to that setting.  Serse, originally sung by a soprano castrato, is now usually performed by a soprano (or mezzo-soprano) and sopranist. <SEP> Il Bellerofonte is an 18th-century Italian opera in three acts by the Czech composer Josef Mysliveček.  It conforms to the serious type (opera seria) that was typically set in the distant past.  The libretto, based on the Greek legend of Bellerophon, was written by Giuseppe Bonecchi.  The work was dedicated to King Ferdinand I of the Two Sicilies and was first performed at the Teatro San Carlo in Naples on 20 January 1767, the birthday of his father, King Charles III of Spain.  The cast featured two stellar singers of the time, Caterina Gabrielli and Anton Raaff, in the leading roles.  The opera was only the composer's second one, and the first that permitted him the opportunity to write music for first-rate vocal artists.  The production was highly successful, indeed responsible for a meteoric rise in his reputation as an operatic composer.  From the time of the premiere of "Bellerofonte" until his death in 1781, Mysliveček succeeded in having more new "opere serie" brought into production than any other composer in Europe.  During the same time span, he also had more new operas staged at the Teatro San Carlo in Naples than any other composer.