I am about to teach Aeschylus' trilogy, the Oresteia , which is actually the only tragic trilogy proper that has survived from antiquity. The basic story is that Agamemnon, on his way to Troy, sacrificed his daughter, Iphigenia, in order to assuage the anger of Artemis, who, along with her brother Apollo, favored the Trojans. In response, when he returned home ten years later, his wife Clytemnestra, and her lover, Aegisthus, murdered him. Yet, in response to that, Orestes, the son of Clytemnestra and Agamemnon avenged his father's death by killing his mother. In turn, the Furies, who punished those who killed a blood relative, sought to punish Orestes. In the end, Orestes lands in Athens as he runs from the Furies. There, Athena, in a new form of justice, decides the case by a judicial court. So, we move from archaic "eye for an eye" justice to new judicial systems represented by the emergent democratic city-state. The Chorus, in the "Agememnon," the first o...