Admeto, re di Tessaglia ("Admetus, King of Thessaly", HWV 22) is a three-act opera written for the Royal Academy of Music with music composed by George Frideric Handel to an Italian-language libretto prepared by Nicola Haym. The story is partly based on Euripides' Alcestis. The opera's first performance was at the Haymarket Theatre in London on 31 January 1727. The original cast included Faustina Bordoni as Alcestis and Francesca Cuzzoni as Antigona, as Admeto was the second of the five operas that Handel composed to feature specifically these two prime donne of the day.
The opera was very successful at its first performances. However the presence of two prima donnas in the London operas had created factions of very partisan supporters of either one or the other ladies, and some performances were disrupted by hisses and loud cat calls by supporters of one of the star sopranos whenever the other one was singing, creating public scandal.
The German-born Handel, after spending some of his early career composing operas and other pieces in Italy, settled in London, where in 1711 he had brought Italian opera for the first time with his opera Rinaldo. A tremendous success, Rinaldo created a craze in London for Italian opera seria, a form focused overwhelmingly on solo arias for the star virtuoso singers. In 1719, Handel was appointed music director of an organisation called the Royal Academy of Music (unconnected with the present day London conservatoire), a company under royal charter to produce Italian operas in London. Handel was not only to compose operas for the company but hire the star singers, supervise the orchestra and musicians, and adapt operas from Italy for London performance.
Handel had composed numerous Italian operas for the Academy, with varying degrees of success; some were enormously popular. The star soprano Francesca Cuzzoni had partnered with internationally renowned castrato Senesino as the leading performers in a long series of Italian operas by Handel and other composers for the Academy, and to increase audience interest, the directors decided to import another celebrated singer from Italy, soprano Faustina Bordoni, so that the operas would have not one but two leading ladies onstage. This was a common practice in opera houses of the day in Italy and Cuzzoni and Faustina, as Bordoni was called, had appeared together in various European cities without incident.