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 widely-known version is, ""what is the creature that walks on four legs in the morning, two legs at noon, and three in the evening?"" Oedipus correctly guesses, ""man"", who crawls on all fours as an infant, walks upright in maturity, and leans on a stick in old age. Bested by the prince, the Sphinx throws herself from a cliff, thereby ending the curse. Oedipus' reward for freeing Thebes from the Sphinx is its kingship, and the hand of the dowager queen, Jocasta; none then realize that Jocasta is Oedipus' true mother. Thus, unknown to all of the characters, the prophecy