He probably meant Oedipus Rex, the King: A character of Greek (Athenian) Mythology (and play by Sophocoles; pardon the spelling), who kills his father and marries his mother. Heard of Oedipus Complex?

If you want to take short cut, you might want to look at cliffnotes. I am sure there should be a cliffnote on Sophocles' "Oedipus The King."