She retaliates by preventing the Greek troops from reaching Troy unless Agamemnon kills his eldest daughter, Iphigenia, at Aulis as a human sacrifice.
"Not all poets took Iphigenia and Iphianassa to be two names for the same heroine," Kerenyi remarks,[5] "though it is certain that to begin with they served indifferently to address the same divine being, who had not belonged from all time to the family of Agamemnon."
Here, Agamemnon, the leader of the Greeks, hunts and then kills a deer in a grove sacred to the goddess Artemis.
Calchas the seer tells Agamemnon that to appease Artemis, he must sacrifice his eldest daughter, Iphigenia.
[7] Some sources claim that Iphigenia was taken by Artemis to Tauris (in Crimea) at the moment of the sacrifice, the goddess having left a deer in her stead,[8] or else a goat (actually the god Pan) in her place.
When King Agamemnon saw his daughter proceeding to the altar to her death, he heaved a deep sigh and turned his head to one side and wept.
Achilles, son of Peleus, circled the altar of the goddess, basket in hand, and upon her he sprinkled holy water and he said, 'Artemis, daughter of Zeus, slayer of wild beasts, you that spin the silver light at night, receive this sacrifice which we offer to you.
We the Greek army and King Agamemnon offer to you the pure blood that flows from a virgin's throat.
When the carcass had been reduced to ashes in Hephaestus's fire, Calchas offered a prayer for the safe homecoming of the army.
"[9]The Hesiodic Catalogue of Women called her Iphimede (Ἰφιμέδη)[10] and told that Artemis transformed her into the goddess Hecate.
[11] Antoninus Liberalis said that Iphigenia was transported to the island of Leuke, where she was wedded to immortalized Achilles under the name Orsilochia.
In Euripides' Iphigenia at Aulis, it is Menelaus who convinces Agamemnon to heed the seer Calchas's advice.
Achilles informs them that the Greek army, eager for war, has learned of the seer's advice and now demand that Iphigenia be sacrificed.
Later, Clytemnestra is told of her daughter's purported death—and how at the last moment, the gods spared Iphigenia and whisked her away, replacing her with a deer.
[12] While in Tauris, Orestes is to carry off the xoanon (carved wooden cult image) of Artemis, which had fallen from heaven, and bring it to Athens.
After a conflict of mutual affection, Pylades at last yields, and the letter makes brother and sister recognize each other, and all three escape together, carrying with them the image of Artemis.
After they return to Greece—having been saved from dangers by Athena along the way—Athena orders Orestes to take the Xoanon to the town of Halae, where he is to build a temple for Artemis Tauropolos.
At the annual festival held there, in honor of Artemis, a single drop of blood must be drawn from the throat of a man to commemorate Orestes's near-sacrifice.
Some very early Greek sources in the Epic Cycle affirmed that Artemis rescued Iphigenia from the human sacrifice her father was about to perform, for instance in the lost epic Cypria, which survives in a summary by Proclus:[15] "Artemis ... snatched her away and transported her to the Tauroi, making her immortal, and put a stag in place of the girl [Iphigenia] upon the altar."
[17] Possible reasons for key discrepancies in the telling of the myth by playwrights such as Euripides are to make the story more palatable for audiences and to allow sequels using the same characters.
[20] The most common scene: "Iphigenia, a little girl, is held over the altar by Odysseus while Agamemnon performs the aparchai.
"[1] He has highlighted six key elements that are shared by each story: The sacrifice of Iphigenia appears in the ancient Roman didactic poem De rerum natura by Lucretius as a criticism of religion.