Oedipus Rex and that deal with the story of Oedipus, "Oedipus Rex" was the second to be written. However, in terms of the chronology of events that the plays describe, it comes first, followed by "Oedipus at Colonus" and then "Antigone". Prior to the start of "Oedipus Rex", Oedipus has become the king of Thebes while unwittingly fulfilling a prophecy that he would kill his father, Laius (the previous king), and marry his mother, Jocasta (whom Oedipus took as his queen after solving the riddle of the Sphinx). The action of Sophocles' play concerns Oedipus' search for the murderer of Laius in
Oedipus Rex descendants (although many scholars regard Laius' transgressions against Chrysippus to be a late addition to the myth). When his son is born, the king consults an oracle as to his fortune. To his horror, the oracle reveals that Laius "is doomed to perish by the hand of his own son". Laius binds the infant's feet together with a pin, and orders Jocasta to kill him. Unable to kill her own son, Jocasta orders a servant to slay the infant for her. The servant then exposes the infant on a mountaintop, where he is found and rescued by a shepherd (in