Oedipus Rex and that deal with the story of Oedipus, "Oedipus Rex" was the second to be written. However, in terms of the chronology of events that the plays describe, it comes first, followed by "Oedipus at Colonus" and then "Antigone". Prior to the start of "Oedipus Rex", Oedipus has become the king of Thebes while unwittingly fulfilling a prophecy that he would kill his father, Laius (the previous king), and marry his mother, Jocasta (whom Oedipus took as his queen after solving the riddle of the Sphinx). The action of Sophocles' play concerns Oedipus' search for the murderer of Laius in
Echo (mythology) Echo (mythology) In Greek mythology, Echo (; , "Ēkhō", "echo", from ἦχος ("ēchos"), "sound") was an Oread who resided on Mount Cithaeron. Zeus loved consorting with beautiful nymphs and often visited them on Earth. Eventually, Zeus's wife, Hera, became suspicious, and came from Mt. Olympus in an attempt to catch Zeus with the nymphs. Echo, by trying to protect Zeus (Zeus ordered her to protect him), endured Hera's wrath, and Hera made her only able to speak the last words spoken to her. So when Echo met Narcissus and fell in love with him, she was unable to tell him