Oedipus is a mythical or fictional king in Greek mythology. He is adopted as a baby. Without knowing who they are, he marries his biological mother, Then they have a baby, But before this, he kills his biological father. The psychologist Sigmund Freud had a theory and he called it the Oedipus complex, after this story.
Oedipus Tyranos, or Oedipus the King, is a well-known tragedy by Sophocles.