In the late 19th century, Monro argued that the scholastic use of the word κυκλικός did not refer to the Cycle as such, but meant "conventional", and that the Cycle was compiled in the Hellenistic period (perhaps as late as the 1st century BCE).
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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.