The Oresteia by Aeschylus (458 b.c.e.). Before Freud there was Aeschylus, who revealed the mind’s darkest impulses through this trilogy of plays mapping the mad round of retaliations that bring down the royal house of Atreus. In the first play, the Greek King Agamemnon— who sacrificed his daughter Iphigenia to appease the gods before setting sail for the Trojan War— and his slave, Cassandra, are slain by his wife, Clytemnestra. In the second play, Clytemnestra is slain by her son, Orestes (egged on by his sister Electra to avenge their father’s murder). In the final play, Orestes is freed from the Furies (or the curse) because, unlike the other characters— who search for scapegoats— he admits his own culpability, ending the cycle of violence through personal responsibility.