The Oresteia

The most famous series of ancient Greek plays, and the only surviving trilogy, is the "Oresteia " of Aeschylus, consisting of "Agamemnon," "Choephoroe," and "Eumenides." These three plays recount the murder of Agamemnon by his queen Clytemnestra on his return from Troy with the captive Trojan princess Cassandra; the murder in turn of Clytemnestra by their son Orestes; and Orestes' subsequent pursuit by the Avenging Furies (Eumenides) and eventual absolution.
Hugh Lloyd-Jones's informative notes elucidate the text, and introductions to each play set the trilogy against the background of Greek religion as a whole and Greek tragedy in particular, providing a balanced assessment of Aeschylus's dramatic art.