Wikipedia
L'Olimpiade is an opera libretto in three acts by Metastasio originally written for an operatic setting by Antonio Caldara of 1733. Metastasio’s plot draws upon the narrative of "The Trial of the Suitors" provided from Book 6 of The Histories of Herodotus. The story, set in Ancient Greece at the time of the Olympic Games, is about amorous rivalry and characters' taking places to gain the loved one. The story ends with the announcement of two marriages.
L'Olimpiade is a dramma per musica in three acts that was composed by Antonio Vivaldi. The opera uses an Italian libretto by Pietro Metastasio that was originally written for Antonio Caldara's 1733 opera of the same name. Vivaldi's version premiered in Venice at the Teatro Sant'Angelo on 17 February 1734.
L'Olimpiade is an 18th-century Italian opera in 3 acts by the Czech composer Josef Mysliveček. It was composed to a libretto by the Italian poet Metastasio that was first performed in 1733. For a performance in the 1770s, it would only be expected that a libretto of such age would be abbreviated and altered to suit contemporary operatic taste; some of the original aria texts would be omitted or substituted, and the remaining aria texts would be set more expansively. In this case, only 14 of the original 18 aria texts of Metastasio were newly set to music. The cuts and changes in the text made for the 1778 performance of Mysliveček's opera are not attributable.