AGAMEMNON, the first part of "The Oresteia", is a play that was first showed to the athenian people in 456 B.C.
Agamemnon, the King of Argos, is coming back from the Trojan war. He's received by his wife, Clytemnestra, who's still hating him for having sacrfized their daughter Iphigenia 20 years before. The same night, Agamemnon is murdered by his wife. Clytemnestra will rule Argos with her lover Aegisthus.