Megacles arrives in Sicyon just in time to enter the Olympic Games under the name of Lycidas, a friend who once saved his life. Unknown to Megacles, Lycidas is in love with Aristaea, whose hand is to be offered to the winner of the games by her father, King Cleisthenes. Lycidas, once betrothed to Princess Argene of Crete, is unaware that Megacles and Aristaea already love each other, and he subsequently tells his friend of the prize. Aristaea and Megacles greet each other fondly, but Megacles now feels bound by his promise to compete as Lycidas. Meanwhile, Argene arrives in Olympia disguised as a shepherdess, to win back Lycidas.
Act 2
Megacles wins the games, confesses the truth to Aristaea and departs, broken-hearted. When Lycidas comes to claim her, Aristaea reproaches him, as does the disguised Argene, much to his dismay. Amyntas, tutor to Lycidas, reports that Megacles has drowned himself, and King Cleisthenes, apprised of the deception, banishes Lycidas.
Act 3
Argene prevents the desperate Aristaea from suicide, Megacles is rescued by a fisherman, and Lycidas contemplates the assassination of the king. Aristaea pleads mercy for Lycidas and Argene offers herself in his place; as proof that she is a princess, she shows Cleisthenes a chain given her by Lycidas. He recognizes it as belonging to his son, abandoned in infancy to forestall the prophecy that he would kill his father. Lycidas, reinstated, accepts Argene, leaving his sister to Megacles.
^ abVoice types and premiere cast according to Strohm (II, pp. 530-531). Because of an oversight the character of Alcandro is not included in the cast list reported at the beginning of the chapter on L'Olimpiade. It is however mentioned below in the same chapter (section: "The action and the music", p. 534 ff), along with the first performer's name and voice type.
Sources
Pietro Metastasio, L'Olimpiade. Dramma per musica, Venice, Rossetti, 1734 (digitized by Library of Congress)
