The Libation Bearers

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.