The subject matter that lies at the heart of this Sophoclean tragedy was narrated in three epics on Theban myth that today survive only in fragments or later descriptions thereof: the Oidipodeia, the Thebaid (the curse of Oedipus, the fraternal feud, the march of the Seven against Thebes) and the Epigonoi (the sons of the Seven’s revenge campaign and the destruction of Thebes). Important and sometimes pre-Sophoclean elements of the myth include: 1. the exposure of the young Oedipus with pierced ankles (whence his name “Swell-footed”); 2. the patricide and incest with his mother (already appearing in Homer’s Odyssey 11.217ff.); 3. the blinding of Oedipus and the curse on his sons …
Zimmermann, Bernhard. "Oedipus Tyrannus". The Literary Encyclopedia. First published 27 October 2011; last revised 30 November -1.
[http://www.litencyc.com/php/sworks.php?rec=true&UID=3153, accessed 27 April 2015.]