Libretti by Metastasio

thumb|upright|Original libretto cover for Johann Adolph Hasse's 1730 setting of Artaserse ''''''' is the name of a number of Italian operas, all based on a text by Metastasio. ' is the Italian form of the name of the king Artaxerxes I of Persia.

Azione teatrale by Christoph Willibald Gluck

libretto by Pietro Metastasio

libretto by Pietro Metastasio

libretto by Pietro Metastasio

thumb|upright|Title page (1733)

libretto by Pietro Metastasio

libretto by Pietro Metastasio

opera by Johann Adolph Hasse

opera by Baldassare Galuppi

Libretto by Pietro Metastasio

Demofonte (also Demofoonte; Il Demofoonte; Demofoonte, ré di Tracia [King of Thrace]; Démophon; Demophontes; or ''Dirce, L'usurpatore innocente'' [Dirce, the Innocent Usurper]) is an opera seria libretto by Metastasio. The libretto was first set by Antonio Caldara in 1733, but remained popular throughout the eighteenth century and was set over seventy times.