Artemidorus of Daldis

Artemidorus was born in Ephesus but took the name Daldianus, of Daldis, from his mother's home city in Lydia, in Roman Asia Minor, out of what he described in his own text as respect for its patron deity Apollo Mystes; he is conventionally dated to the second century CE on the basis of internal and contextual evidence rather than any external biographical record. He worked as a professional oneiromantis, a dream interpreter, describing in his own introduction how he collected material for years by consulting practicing diviners across Greece, Italy and Asia Minor and recording the dreams and outcomes ordinary clients reported to them.

That claimed grounding in collected case material, rather than purely inherited literary or philosophical dream theory, is what Artemidorus himself presented as distinguishing his work from earlier writers on dreams, and it gives his surviving text an unusually practical, catalog like character. Little else of his personal biography survives beyond what can be inferred from his own writing, a common situation for technical writers of the period whose public identity rests almost entirely on a single influential text.

His explicit statement of method, that he consulted working diviners in the marketplace rather than relying solely on earlier written authorities, is itself a notable claim for a technical writer of his period to make, positioning collected practical experience above inherited literary tradition in a way many of his ancient contemporaries writing on comparable subjects did not.

The Oneirocritica, in five books, is organized around a central interpretive principle that remains influential in dream analysis discussion today: a dream's meaning depends on the dreamer's own specific circumstances, not on a single fixed symbol table applied uniformly to everyone, so the same dream image can mean different things to a rich man and a poor one, a married woman and an unmarried one. Books one and two present Artemidorus's systematic catalog of dream images and their situational meanings; book three adds supplementary material; books four and five, addressed directly to his son, are more reflective, discussing method and presenting case examples.

The work is the only complete dream interpretation manual to survive intact from classical antiquity, making it an exceptionally important primary source for how dreams were actually read as religious and predictive phenomena in the Greco-Roman world, distinct from and considerably more systematic than the briefer dream passages surviving in other ancient literature. Its influence continued well beyond antiquity, cited by writers into the early modern period and still referenced in modern historical and psychoanalytic discussion of ancient dream theory, including by Sigmund Freud.