Thebes is the setting of oedipus rex theme rival downfall rex?

Oedipus Rex is a play by Sophocles that tells the story of Oedipus, a king of Thebes who unknowingly kills his father and marries his mother. The play is set in Thebes, a city in ancient Greece. The theme of Oedipus Rex is the downfall of a king, and the play explores the idea that even the most powerful people are not immune to fate. The play also explores the idea of rivalry, as Oedipus is constantly competing with his brother-in-law, Creon, for power.