A misty figure

A misty figure with the name Critodemus appears briefly in a list of the founders of the Greek astrological tradition given by Firmicus Maternus a Latin writer of about AD 356, in his De erroribus profanorum religionum, among purely imaginary personages such as Hermes, Orpheus and Nechepso. This kind of thing plagues anyone attempting to trace astrological history. Was Critodemus imaginary too? Or did he indeed construct the horoscopes he is said to have drawn up? There is a treatise ascribed to him, Horasis, from which later astrologers learned: one, Hephaistion, relied utterly on his astrological formula for determining whether a child would be still-born.