Oedipus Rex is a Greek tragedy by Sophocles in which King Oedipus of Thebes discovers that he has unknowingly killed his father and married his mother, thereby fulfilling a prophecy he tried to avoid. It is foundational because it becomes a model for Western tragedy, for theories of plot and character, and for thinking about fate, responsibility, and knowledge.wikipedia+2

Core plot in stages

Why it is foundational

Key themes that make it endure

Why the play is still relevant