Peripeteia by Polybus and his wife, Merope, the rulers of another kingdom. The irony of the Messenger’s information is that it was supposed to comfort Oedipus and assure him that he was the son of Polybus. Unfortunately for Oedipus, the Messenger says, "Polybus was nothing to you, [Oedipus] that’s why, not in blood" (Sophocles 1113). The Messenger received Oedipus from one of Laius’ servants and then gave him to Polybus. The plot comes together when Oedipus realizes that he is the son and murderer of Laius as well as the son and husband of Jocasta. Martin M. Winkler says that here,
The Infernal Machine (play) of the Ghost of King Laius, when the Officer arrives. The Officer questions the two about the ghost sighting and leaves them to their duties. Tiresias and Jocasta enter and question the soldiers about the ghost sighting as well. As Jocasta begins to believe more and more, the ghost of King Laius appears. Despite his calls for his wife, he cannot be seen or heard by anyone else. After the cock crows in the dawn, Tiresias and Jocasta exit. After the two leave stage, the ghost of King Laius becomes audible and visible to the two soldiers. Laius struggles, apparently