In The Libation Bearers (Χοηφόροι, Choēphóroi)—the second play of Aeschylus' Oresteia trilogy—many years after the murder of Agamemnon, his son Orestes returns to Argos with his cousin Pylades to exact vengeance on Clytemnestra, as an order from Apollo, for killing Agamemnon. Upon arriving, Orestes reunites with his sister Electra at Agamemnon's grave, while she was there bringing libations to Agamemnon in an attempt to stop Clytemnestra's bad dreams. Shortly after the reunion, both Orestes and Electra, influenced by the Chorus, come up with a plan to kill both Clytemnestra and Aegisthus.
Orestes then heads to the palace door where he is greeted by Clytemnestra. He pretends he is a stranger and tells Clytemnestra that he (Orestes) is dead, causing her to send for Aegisthus. Unrecognized, Orestes is then able to enter the palace where he then kills Aegisthus, who was without a guard due to the intervention of the Chorus in relaying Clytemnestra's message. Clytemnestra then enters the room. Orestes hesitates to kill her, but Pylades reminds him of Apollo's orders, and he eventually follows through. Consequently, after committing the matricide, Orestes is now the target of the Furies' merciless wrath and has no choice but to flee from the palace.