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Calchas, the great seer, prophesies that King Agamemnon must sacrifice his own daughter, Iphigenia, in order to guarantee fair winds for the king's fleet en route to Troy –- a demand that comes from the goddess Diana herself. Throughout the opera, Agamemnon struggles with the terrible choice between sparing his daughter's life and ensuring his subjects' welfare.
Agamemnon summons his daughter to Aulis, the port where the Greek navy is gathering, ostensibly for her to marry Achilles, the great warrior hero. Then, reconsidering his decision to sacrifice her, the king tries to prevent her arriving with the fabricated explanation that Achilles has been unfaithful. Iphigenia, however, has already reached the Greek camp accompanied by her mother Clytemnestra. The two women are dismayed and angered by Achilles' apparent inconstancy, but he eventually enters declaring his enduring love for the girl, and the first act ends with a tender scene of reconciliation.
The wedding ceremony is due to be celebrated and festivities take place with dances and choruses. When the couple are about to proceed to the temple, however, Arcas, the captain of Agamemnon's guards, reveals that the king is awaiting his daughter before the altar in order to kill her. Achilles and Clytemnestra rush to save the girl from being sacrificed. Agamemnon finally seems to give up his plan to kill her.
The third act opens with a chorus of Greeks: they object to the king's decision in case they are never allowed to reach Troy, and demand the ceremony be celebrated. At this point, Iphigenia resigns herself to her fate, and offers her own life for the sake of her people, while Clytemnestra entreats the vengeance of Jupiter upon the ruthless Greeks. As the sacrifice is going to be held, however, Achilles bursts in with his warriors and the opera concludes with Gluck's most significant revision of the original myth: Calchas' voice rises over the general turmoil and announces that Diana has changed her mind about the sacrifice and consents to the marriage. In the second 1775 version Diana appears personally to consecrate both the wedding and Agamemnon's voyage.
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