Oedipus Rex reveals the prophecy which caused him to leave Corinth (791-93): "that I was fated to lie with my mother," "and show to daylight an accursed breed" "which men would not endure, and I was doomed" "to be murderer of the father that begot me." The implication of Laius's oracle is ambiguous. One interpretation considers that the presentation of Laius's oracle in this play differs from that found in Aeschylus's Oedipus trilogy produced in 467 BC. Helaine Smith argues: Sophocles had the option of making the oracle to Laius conditional ("if" Laius has a son, that son will kill him) or
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