Many years later, a plague of infertility struck the city of Thebes, affecting crops, livestock and the people. Oedipus asserted that he would end the pestilence. He sent his uncle, Creon, to the Oracle at Delphi, seeking guidance. When Creon returned, Oedipus learned that the murderer of King Laius must be brought to justice, and Oedipus himself cursed the killer of his wife's late husband, saying that he would be exiled. Creon also suggested that they try to find the blind prophet, Tiresias, who was widely respected. Oedipus sent for Tiresias, who warned him not to seek Laius' killer. In a heated exchange, Tiresias was provoked into exposing Oedipus himself as the killer, and the fact that Oedipus was living in shame because he did not know who his true parents were. Oedipus angrily blamed Creon for the false accusations, and the two argued. Jocasta entered and tried to calm Oedipus by telling him the story of her first-born son and his supposed death. Oedipus became nervous as he realized that he may have murdered Laius and so brought about the plague. Suddenly, a messenger arrived from Corinth with the news that King Polybus had died. Oedipus was relieved for the prophecy could no longer be fulfilled if Polybus, whom he considered his birth father, was now dead.