The 9th-century AD scholar and clergyman Photius, in his Bibliotheca, considered the Theban Cycle part of the Epic Cycle; however, modern scholars normally do not.
The stories in the Theban Cycle were traditional ones: the two Homeric epics, the Iliad and Odyssey, display knowledge of many of them. The most famous stories in the Cycle were those of Oedipus and of the "Seven against Thebes", both of which were heavily drawn on by later writers of Greek tragedy.
The Thebaid, of uncertain authorship but sometimes attributed in antiquity to Homer: told the story of the war between Oedipus' two sons Eteocles and Polynices, and of Polynices' unsuccessful expedition against the city of Thebes with six other commanders (the "Seven Against Thebes"), in which both Eteocles and Polynices were killed.
The Epigoni, attributed in antiquity to either Antimachus of Teos or Homer: a continuation of the Thebaid, which told the story of the next generation of heroes who attacked Thebes, this time successfully.