Egisto (Aegisthus) is an opera in a prologue and three acts by Francesco Cavalli. It was designated as a favola dramatica musicale. The Italian libretto was by Giovanni Faustini, his second text for Cavalli.
Egisto was a descendant of the sun-god Apollo. Over a year before the action begins he loved Clori and she returned his love. While spending time together on the seashore on the island of Delos, they were captured by pirates and sold separately into captivity. Climene, a young woman on the island of Zacynthos, was captured roughly at the same time by the same pirates on the very day of her marriage to Lidio. She was sold to the same cruel master as Egisto. A year later, they have managed to escape and Egisto has escorted Climene back to her home island of Zacynthos, where the main action takes place. They both set to find their original lovers. What they do not know is that the pirates brought Clori to Zacynthos, where she fell in love with Lidio. Climene's brother, Ipparco, also fell in love with her.
The division into acts reflects the passage of the day from dawn through night to dawn again, as to keep with Egisto's heritage as a descendant of the Sun.
Set during the morning of the day after Egisto and Climene have landed on the island, the situation of the two mis-matched couples is established. Lidio and Clori are lovers while Egisto and Climene are friends.
In the afternoon, Egisto and Climene are trying to get back to their former lovers, only to be rejected by them.
When the night falls, we see the machinations of the gods behind the sufferings of the characters on earth. Lidio is captured by Ipparco, and Egisto goes mad. The story is however brought to a happy conclusion.
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