Sophocles on stylistic elements, with "Oedipus Rex" coming in Sophocles' middle period. Most of Sophocles' plays show an undercurrent of early fatalism and the beginnings of Socratic logic as a mainstay for the long tradition of Greek tragedy. The Theban plays consist of three plays: "Oedipus Rex" (also called "Oedipus Tyrannus" or "Oedipus the King"), "Oedipus at Colonus" and "Antigone". All three plays concern the fate of Thebes during and after the reign of King Oedipus. They have often been published under a single cover. Sophocles, however, wrote the three plays for separate festival competitions, many years apart. Not only are
Oedipus at Colonus of guilt; the fact that Oedipus is "rationally innocent" – that he sinned unknowingly – decreases his guilt, allowing his earthly sufferings to serve as sufficient expiation for his sins. Darice Birge has argued that "Oedipus at Colonus" can be interpreted as a heroic narrative of Oedipus rather than a tragic one. It can be viewed as a transitional piece from the Oedipus of "Oedipus Rex" whose acts were abominable to the Oedipus we see at the end of "Oedipus at Colonus", who is so powerful that he is sought after by two separate major cities. The major image used