Seven Against Thebes
In 467 BC, Sophocles's fellow tragedian Aeschylus won first prize at the City Dionysia with a trilogy about the House of Laius, comprising "Laius", "Oedipus" and "Seven Against Thebes" (the only play which survives). Since he did not write connected trilogies as Aeschylus did, "Oedipus Rex" focuses on the titular character while hinting at the larger myth obliquely, which was already known to the audience in Athens at the time.