The Oresteian Trilogy by Aeschylus

After the Fall of Troy King Agamemnon returns to Argos a victor in war. Agamemnon depicts the heros discovery that his family has been destroyed by his wifes infidelity and ends with his death at her callous hand. Clytemnestras crime is repaid in The Choephori when her outraged son Orestes kills both her and her lover.