Œdipe (opera) is suspicious that Creon wants to usurp him, and dismisses Tiresias and Creon from his sight. Meanwhile, Jocasta tries to comfort Oedipus, and tells of the circumstances of the killing of Laius, which disturbs Oedipus. The shepherd confirms Jocasta's story. From Corinth, Phorbes then arrives to ask Oedipus to succeed Polybus, and then reveals that Polybus and Merope were his adoptive parents, not his biological parents. It turns out that Merope's own child had died at birth, and Phorbes replaced that child with Oedipus, whom the Shepherd had not the heart to abandon to the elements. Oedipus now understands the
Laius raped the king's son, Chrysippus, and carried him off to Thebes while teaching him how to drive a chariot, or as Hyginus records it, during the Nemean games. This abduction is thought to be the subject of one of the lost tragedies of Euripides. With both Amphion and Zethus having died in his absence, Laius became king of Thebes upon his return. After the rape of Chrysippus, Laius married Jocasta or Epicasta, the daughter of Menoeceus, a descendant of the Spartoi. Laius received an oracle from Delphi which told him that he must not have a child, or the child