Incubus

Incubus and Ephialtes in the Ancient World

In the ancient Mediterranean world, the incubus was understood as a daimonic presence that appeared to selected individuals and conveyed messages, instructions, revelations, and other forms of divinatory communication. Ancient authors describe the incubus as manifesting either during sleep or while awake, occupying the liminal boundary between dream, vision, trance, and ordinary perception. The experience was therefore not necessarily regarded as imaginary. It was understood as a genuine encounter with an unseen intelligence that could be perceived by an individual person.

The incubus was closely associated with a masculine anthropomorphic presence known as Ephialtes. Artemidorus identified Ephialtes with Pan and described him as capable of several forms of interaction with the person he visited. Ephialtes might silently press upon the body of the dreamer, an action reflected in the name itself, which was connected to the idea of “throwing oneself upon” another person. He might engage the dreamer in conversation, answer questions, or participate in explicitly sexual encounters. These experiences were not viewed as random fantasies but as encounters with a daimonic presence operating within the dream state or altered states of consciousness.

Ancient evidence suggests that such encounters were understood as having both subjective and objective dimensions. The incubus was experienced by an individual consciousness, yet was often treated as an independent daimon acting upon that person. In this framework, dreams, visions, and incubatory experiences could be influenced or even induced by external agents. Temples, ritual specialists, physicians, and daimones themselves were all believed capable of shaping the experiences perceived by an individual. Thus the incubus was not merely a private hallucination but part of a larger ancient model in which influences, messages, and divine directives could be projected into human awareness through dreams, trance states, and visionary encounters.

Despite its fearsome reputation in later folklore, Ephialtes was not always regarded as harmful. Ancient sources report that he restored the sick to health and, notably, never visited those already on the brink of death. His appearance therefore occupied a curious middle ground between divine messenger, healer, and supernatural visitor. This healing aspect was emphasized by Oribasius, who described Ephialtes as “a sacred interpreter and servant of Asclepius,” directly linking the phenomenon to the healing traditions of the great medical god.

Alongside these religious interpretations, ancient physicians also treated Ephialtes as a medical condition. Medical writers described it as a serious disorder and in some cases as an early sign of conditions associated with insanity, including epilepsy, madness, and apoplexy. Treatments for Ephialtes are already recorded in the first century CE by Scribonius Largus and Dioscorides, demonstrating that physicians regarded the phenomenon as something that could be therapeutically addressed. Themison of Laodicea further connected Ephialtes with choking or suffocation, referring to it as a form of pnigalion, while later Byzantine tradition went so far as to identify Ephialtes with lycanthropy.

The ancient evidence therefore presents the incubus and Ephialtes as a remarkably complex phenomenon. They could be understood simultaneously as daimones, dream visitors, healers, interpreters of divine messages, manifestations of Pan, symptoms of medical disorders, or states associated with altered consciousness. Rather than separating the supernatural from the psychological or medical, ancient thinkers often held all of these possibilities together. The incubus was a phenomenon that stood at the intersection of religion, medicine, dreams, prophecy, healing, sexuality, and consciousness itself.

Sources

• Incubi were understood as personified daimōnes who conveyed divinatory messages and directives to selected individuals.
  • Citations:
    • Plato, Symposium 202d–203a
    • Greek Magical Papyri 324–325 (Betz edition)
    • Paul of Nicaea 26

• An incubus could appear either while a person was awake or asleep.
  • Citations:
    • Plato, Symposium 202d–203a
    • Greek Magical Papyri 324–325 (Betz edition)
    • Paul of Nicaea 26

• Incubi were associated with a masculine anthropomorphic figure called Ephialtes.
  • Citations:
    • Artemidorus of Daldis, Oneirocritica 2.27.3

• Artemidorus identified Ephialtes with Pan.
  • Citations:
    • Artemidorus of Daldis, Oneirocritica 2.27.3

• According to Artemidorus, Ephialtes could interact with dreamers in several ways:
  • weighing down the body in silence,
  • having sexual intercourse with the dreamer,
  • answering questions posed by the dreamer.
  • Citations:
    • Artemidorus of Daldis, Oneirocritica 2.27.3

• The name Ephialtes was connected etymologically with the idea of “throwing oneself upon someone” (ἐφαλλέσθαι / ephallesthai).
  • Citations:
    • Artemidorus of Daldis, Oneirocritica 2.27.3

• Ephialtes was believed to restore sick people to health.
  • Citations:
    • Prognostic tradition (cited in the passage)

• Ephialtes was said never to visit a person who was already on the verge of death.
  • Citations:
    • Prognostic tradition (cited in the passage)

• In medical literature, Ephialtes was regarded as a serious medical condition.
  • Citations:
    • Oribasius, Synopsis 8.2.2–3
    • Paul of Aegina, 3.15 (quoting Soranus)

• Ancient physicians considered Ephialtes an early sign of disorders associated with insanity, including epilepsy, madness, and apoplexy.
  • Citations:
    • Posidonius apud Aëtius 6.12.13–14
    • Galen, Commentary on Hippocrates’ Prognostics 1.4 (Kühn 18b, 18)

• Treatments for Ephialtes were already recorded in the first century CE.
  • Citations:
    • Scribonius Largus, Compositiones 100
    • Dioscorides, 3.140
    • Euporista 1.28

• Oribasius described Ephialtes as “a sacred interpreter and servant of Asclepius.”
  • Citations:
    • Oribasius of Pergamum, Synopsis 8.2.2–3

• The Suda equated Ephialtes with lycanthropy.
  • Citations:
    • Suda ε 3909 (= Adler 2, 486)

• Themison of Laodicea referred to Ephialtes as “pnigalion,” linking it to suffocation or choking.
  • Citations:
    • Themison of Laodicea apud Caelius Aurelianus, Tardae Passiones 1.3.56–57

• The term pnigalion derives from the concept of being choked or asphyxiated (πνίγεσθαι, pnigesthai).
  • Citations:
    • Themison of Laodicea apud Caelius Aurelianus, Tardae Passiones 1.3.56–57

see also

• The Definition and Function of the Incubus as ancient medicine, divination PGM