Artemidorus and the Oneirocritica

Artemidorus’s Oneirocritica is quoted more often than any other historical source on this site, for good reason: it’s the most complete surviving guide to ancient dream interpretation, and its method is considerably more careful than its later reputation as a simple “dream dictionary” suggests.

Who He Was

Artemidorus of Daldis (sometimes called Artemidorus Ephesius) was a professional dream interpreter and writer active in the 2nd century CE, working within the Greco-Roman world.

The Work

The Oneirocritica (“The Interpretation of Dreams”) is a five-book treatise covering an enormous range of dream subjects - animals, body parts, family relationships, everyday activities - gathered, by Artemidorus’s own account, partly through direct research: he describes travelling and consulting professional dream interpreters across the Mediterranean world, and collecting dream reports directly, an unusually empirical approach for the period.

His Method

What sets Artemidorus apart from the “dream dictionary” format later associated with his name is his insistence that a dream symbol’s meaning depends on the dreamer’s specific circumstances - their occupation, health, social status, and personal situation - rather than one fixed universal meaning applying to everyone equally. He also distinguished between different categories of dreams, including those he considered straightforward representations of future events and those he considered allegorical, requiring careful interpretation rather than a literal reading.

This is, notably, much closer to this site’s own approach than to the fixed-meaning format of later popular dream dictionaries. See Do Dreams Have Universal Meanings? for more on that contrast.

His Legacy

The Oneirocritica was hugely influential on later Byzantine, Islamic, and European dream interpretation traditions, and remains a foundational reference for historians of dream interpretation today - not because its individual interpretations are considered valid by modern standards, but because of its unusually systematic method and scope for its period. It’s for this reason that pages across this site - including Dreams About Snakes - cite Artemidorus specifically, rather than a vaguer appeal to “ancient belief.”