Oedipus answers the Sphinx’s riddles, and rids Thebes of its stranglehold. The citizens of Thebes anoint him king, and he marries the queen Jocasta. Soon after Thebes reels under a deadly poisonous air, and is reduced to a graveyard. Oedipus instructs Creon, Jocasta’s brother, to visit the Delphic Oracle and know the cause for this. The oracle declares that the killer of former king, Laius, needs to be identified and killed. Oedipus vows to hunt out the killer and exile him. The blind seer Tiresias is summoned. He declares that Oedipus is the killer. It is revealed through a series of incidents that unknowingly, Oedipus had actually killed Laius. Shattered by this revelation, Jocasta commits suicide. Handing over the charge of his child Antigone to Creon, Oedipus goes on a self:imposed exile, honouring his vow to Thebes.