Actually, the Oedipus story far precedes the formation of
tragedy in
Ancient Greece and derives from
the Theban Cycle which was lost somewhere during the
Middle Ages.
Aeschylus wrote a trilogy of plays concerning the myth, from which only the first part, "Seven Against Thebes", survived. His version of the myth varies in several important points from Sophocles' later one in several important points.
The third Oedipan play is "Oedipus in Colonos".
The myth of Oedipus has parallels in almost every civilization known to mankind.