Paradoxography is a genre of "Classical literature which deals with the occurrence of abnormal or inexplicable phenomena of the natural or human worlds.
Early surviving examples of the genre include:
It is believed that the "pseudo-Aristotelian "On Marvellous Things Heard (De mirabilibus auscultationibus) "contains a core of early material from the "Hellenistic period which was then added to over time, including some material that was added in the 2nd century C.E. or even later."
"Phlegon of Tralles's Book of Marvels, which dates from the 2nd century AD is perhaps the most famous example of the genre, including in the main, stories of human abnormalities. Phlegon's brief accounts of prodigies and wonders include ghost stories, accounts of monstrous births, strange animals like centaurs, hermaphrodites, giant skeletons and prophesying heads. Phlegon's writing is characterised by brief and forthright description, as well as by a tongue-in-cheek insistence on the veracity of his claims.