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 and the Sphinx and evil, but also between the sexes, and that the opening poem of "Buch der Leider" by Heinrich Heine was the source for the idea of the painting. In that poem the Sphinx triumphs over Oedipus. In a Freudian interpretation, it has been argued that the Sphinx represents the castrating effect of Moreau's mother that he has seeking to escape. At the time the painting was created, Moreau's father had recently died. By contrast, Henri Dorra has suggested that the poses of the sphinx and Oedipus are derived from the Greek etymological meaning of the word sphinx, which is to