plot
The mention of this crossroads causes Oedipus to pause and ask for more details. He asks Jocasta what Laius looked like, and Oedipus suddenly becomes worried that Tiresias's accusations were true. Oedipus then sends for the one surviving witness of the attack to be brought to the palace from the fields where he now works as a shepherd.
Jocasta, confused, asks Oedipus what the matter is, and he tells her. Many years ago, at a banquet in Corinth, a man drunkenly accused Oedipus of not being his father's son. Bothered by the comment Oedipus went to Delphi and asked the oracle about his parentage. Instead of answers he was given a prophecy that he would one day murder his father and sleep with his mother. Upon hearing this he resolved to leave Corinth and never return. While traveling he came to the very crossroads where Laius was killed, and encountered a carriage which attempted to drive him off the road. An argument ensued and Oedipus killed the travelers, including a man who matches Jocasta's description of Laius. Oedipus has hope, however, because the story is that Laius was murdered by several robbers. If the shepherd confirms that Laius was attacked by many men, then Oedipus is in the clear.
A man arrives from Corinth with the message that Oedipus's father has died. Oedipus, to the surprise of the messenger, is made ecstatic by this news, for it proves one half of the prophecy false, for now he can never kill his father. However, he still fears that he may somehow commit incest with his mother. The messenger, eager to ease Oedipus's mind, tells him not to worry, because Merope was not in fact his real mother.
It emerges that this messenger was formerly a shepherd on Mount Cithaeron, and that he was given a baby, which the childless Polybus then adopted. The baby, he says, was given to him by another shepherd from the Laius household, who had been told to get rid of the child. Oedipus asks the chorus if anyone knows who this man was, or where he might be now. They respond that he is the same shepherd who was witness to the murder of Laius, and whom Oedipus had already sent for. Jocasta, who has by now realized the truth, desperately begs Oedipus to stop asking questions, but he refuses and Jocasta runs into the palace.