Two mythological characters come into view in the prologue: Sole and Amore. Sole is elated that Giasone will marry with Queen Medea and so he brightens the sun with the brightest light. Cupid scolds Sole because no one asks her for permission for this marriage. Giasone is already married and has two twin children. After Amore’s aria, they argue over this problem without resolution. Ercole complains that Giasone does not wake up although the sun is shining.
Ercole worries about Giasone that he enjoys the pleasures of love with Medea. As a consequence, he could not carry out his duties. Captain Besso persuades Ercole that all men have their own vices, so Besso tells Giasone is okay. Giasone appears and sings the aria “Delizie, content.”
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Giasone and Medea agree to meet with her, even though Medea confesses jealously. Medea wants to know who Isifile is. Furthermore, Giasone tells Medea that he does not like Isifile anymore, but Medea is skeptical about that. Giasone and Medea meets with Isifile. Giasone tells Isifile that he never loved her. As a consequence, Isifile’s emotion changes from happiness to fury. Besso and Delfa talk to Medea and Isifile about Giasone’s disputable marriages. Later on, Medea and Giasone sing the duet “Dormi, dorm”, and they fall asleep in each other’s arms. Besso finds out Giasone and Medea sleeping with each other. He feels jealousy because he wants to find a lover, then he sings the strophic aria “Non e put bel placer.” Isifile also finds out Giasone and Medea sleeping with each other. Isifile wakes Giasone up to discuss about this happening. Giasone worries about Medea that she could wake up and could find Giasone. As a matter of fact, Medea has woken up but to pretend she is still sleeping because she wants to hear their conversation. Giasone gives Isifile a kiss, and Medea wakes up and scorns Giasone. Because of this, Giasone orders Besso to kill …show more content…
Giasone also tells Besso to go to the Vally of the Orseno and tells him to wait for a courier who will ask a question to him. If he hears the question, then he should throw the courier into the sea. On the one hand, Isifile starts to go to the Valley of Orseno, and she is happy because she thinks Giasone has returned to her. On the other hand, Medea is waiting in the Valley of Orseno to see Besso throwing Isifile into the sea. When Besso arrives in the Valley of Orseno, Medea asks a question to Besso before Isifile arriving in this place. Besso then throws Medea into the sea. Besso tells Giasone that he has killed a queen, but Besso does not say the queen’s name. Therefore, Giasone believes that the queen is Isifile. Egeo thinks Giasone wants to kill Medea, and he plans to take revenge on Giasone. Giasone regrets that he has killed Isifile then he faints. Egeo finds Giasone, and he takes out his dagger to kill Giasone; however, Isifille comes to Egeo to take the dagger out of his hands. After Besso arrives with his soldiers, Giasone realizes that Isifile is alive. Besso tells Giasone that he has killed Medea. When Medea shows up, Giasone thinks that Besso is a betrayer. However, Medea confirms that Besso tried to kill her, and she no longer loves Giasone. She loves Egeo now, and she tells Giasone to go back to Isifile. Isifile admits that she still loves Giasone, and she