Libation bearers

"Orestes, Agamemnon's son, returns from exile with his friend Pylades and dedicates a lock of his hair on his father's grave. His sister Electra and the Chorus of Trojan Women come to offer libations at the tomb and in a deeply moving scene brother and sister recognize one another. They swear to avenge their father's death as directed by Apollo."@en
"The play opens as Orestes, Agamemnon's son, returns from exile with his friend Pylades and dedicates a lock of his hair on his father Agamemnon's tomb. His sister Electra and the Chorus of Trojan Women come to offer libation at the tomb. They swear to avenge their father's death, as they have been directed to do by Apollo. Disguised as strangers, Orestes and Pylades enter Agamemnon's palace and Orestes first kills Aegisthus and then his mother Clytemnestra. Threatened by the Furies, he flees to seek Apollo's help."@en
"Choephori (The Libation bearers) is the second play of the Oresteia -- the oldest surviving classical tragedy."@en