Prologue.—A watchman, stationed upon the palace roof at Argos, laments the tedium of his long and solitary task; and prays for the time to come when, through the darkness of the night, he shall see the distant flashing of the beacon fire, and by this sign know that Troy has fallen and that Agamemnon is returning home. And suddenly he sees the gleam for which so long he has been waiting. He springs up with shouts of joy and hastens to tell the queen. At the same time he makes dark reference to that which has been going on within the palace, and which must now be hushed up.
Prologue.—The ghost of Thyestes coming from the lower regions recites the motif of the play: how he had been most foully dealt with by Agamemnon's father, Atreus, and how he had been promised revenge by the oracle of Apollo through his son Aegisthus, begotten of an incestuous union with his daughter. The ghost announces that the time for his revenge is come with the return of Agamemnon from the Trojan war, and urges Aegisthus to perform his fated part.
Parode, or chorus entry.—A chorus of twelve Argive elders sings of the Trojan War, describing the omens with which the Greeks started on their mission of vengeance. They dwell especially upon the hard fate which forced Agamemnon to sacrifice his daughter. And in this they unconsciously voice one of the motives which led to the king's own death.
Parode, or chorus entry.—The chorus of Argive women complains of the uncertain condition of exalted fortune, and recommends the golden mean in preference to this.
First episode.—Clytemnestra appears with a stately procession of torch-bearers, having set the whole city in gala attire, with sacrificial incense burning on all the altars. The chorus asks the meaning of this. Has she had news from Troy? The queen replies that this very night she has had news, and describes at length how the signal fires had gleamed, and thus the news had leaped from height to height, all the long way from Troy to Argos.
And this sure proof and token now I tell thee,
Seeing that my lord hath sent it me from Troy.
She expresses the hope that the victors in their joy will do nothing to offend the gods and so prevent their safe return:
May good prevail beyond all doubtful chance!
For I have got the blessing of great joy.