Oedipus the total absence of ancient descriptions or résumés – though it has been suggested that a part of Hyginus' narration of the Oedipus myth might in fact derive from Euripides' play. Some echoes of the Euripidean Oedipus have been traced also in a scene of Seneca's Oedipus (see below), in which Oedipus himself describes to Jocasta his adventure with the Sphinx. At least three other 5th century BC authors who were younger than Sophocles wrote plays about Oedipus. These include Achaeus of Eretria, Nichomachus and the elder Xenocles. The "Bibliotheca", a Roman-era mythological handbook, includes a riddle for the Sphinx,
Oedipus Rex the prophecy that the king had sought to avoid by exposing Oedipus at birth is fulfilled. Before arriving at Thebes, Oedipus encounters the Sphinx, a legendary beast with the head and breast of a woman, the body of a lioness, and the wings of an eagle. The Sphinx was sent to the road approaching Thebes as a punishment from the gods, and would strangle any traveler who failed to answer a certain riddle. The precise riddle asked by the Sphinx varied in early traditions, and is not stated in "Oedipus Rex", as the event precedes the play; but the most