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 childhood. … he can no longer ignore a feeling of uncertainty about his parentage. However, after consulting the Oracle this uncertainty disappears, strangely enough, and is replaced by a totally unjustified certainty that he is the son of Merope and Polybus. We have said that this irrational behaviour - his hamartia in Aristotle's sense - is due to the repression of a whole series of thoughts in his consciousness, in fact everything that referred to his earlier doubts about his parentage. The exploration of this theme in "Oedipus Rex" is paralleled by the examination of the conflict between the individual