Mystical systems
Hermes Trismegistus
Direct answer
Hermes Trismegistus: Hermes Trismegistus, the thrice-great Hermes, is the legendary sage formed from the Greek god Hermes and the Egyptian god Thoth, in whose name the Hermetic writings were composed.
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At a glance
- Also called
- thrice great hermes, hermes trismegistos, hermes thoth, mercurius trismegistus
- Found in
- Mystical Systems
- Related
- Hermeticism, Corpus Hermeticum, Emerald Tablet, The Kybalion
Hermes Trismegistus, the thrice-great Hermes, is the legendary sage formed from the Greek god Hermes and the Egyptian god Thoth, in whose name the Hermetic writings were composed.
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Was Hermes Trismegistus a real person?
Hermes Trismegistus is a name and not a known person. Greeks living in Egypt identified their god Hermes, the messenger and guide of souls, with Thoth, the Egyptian god of writing, reckoning and wisdom. Out of the two grew a figure pictured as a human teacher of immense age, the author of books on God, the stars, medicine and the working of metals. Trismegistus means thrice greatest, and echoes an Egyptian way of praising Thoth as great three times over.
The writings that carry his name were composed by unknown authors in Roman Egypt in the first centuries of the Christian era. Setting a book under the name of an ancient authority was an accepted practice then, a way of claiming a tradition more than a fraud in the modern sense.
On the tree of the hidden arts: The Hermetic principles.
What sets Hermes Trismegistus apart
The figure is a deliberate joining of two gods of the written word. Thoth was scribe of the Egyptian gods and reckoner of time, Hermes the Greek messenger and guide of souls, and Greeks in Egypt had long treated them as one. What marks Trismegistus out is that he was imagined as a mortal teacher with pupils and descendants, so that a whole library could be credited to him. Each later age remade him: a pagan prophet for the Church Fathers, Idris for Muslim writers, a contemporary of Moses for the Renaissance.
- Title: Greek Trismegistos, 'thrice greatest', after Egyptian praise of Thoth as three times great
- Two gods: Greek Hermes and Egyptian Thoth, whose city Khemenu the Greeks named Hermopolis
- Christian readers: Lactantius cited him with respect about 300; Augustine censured him in The City of God
- Islamic tradition: identified with the prophet Idris; Abu Ma'shar wrote of three sages called Hermes
- Siena Cathedral: shown in the pavement in the 1480s and labelled a contemporary of Moses
- Unmasked: Isaac Casaubon, 1614, dated the writings in his name to the early Christian centuries
Often mistaken for something else: The Greek god Hermes is a figure of myth and cult; Hermes Trismegistus is a legendary human sage built from him and from Thoth, to whom books could be ascribed.
The story behind Hermes Trismegistus
Christian writers took him for a real man. Lactantius, about the year 300, cited him as a pagan who had glimpsed the truth, and Augustine, a century later, censured him. Arabic authors identified him with the prophet Idris and told of three sages named Hermes. In the 1480s he was set into the pavement of Siena Cathedral as a contemporary of Moses. In 1614 Isaac Casaubon showed from the Greek of the texts that they could not be so old, and Hermes passed from history into legend.
Why Hermes Trismegistus matters
Nearly every Hermetic text speaks in his voice, so knowing that the name is a mask and not a man changes how each of them is dated and read.
How to read Hermes Trismegistus
Readers treat the name as the label of a tradition: a saying of Hermes means a saying from the Hermetic books, to be traced to the one it stands in.
Hermes Trismegistus in practice: an example
A reader who meets a saying credited to Hermes Trismegistus can ask which book it comes from, and whether that book is ancient, medieval or modern.
Where readings of Hermes Trismegistus go wrong
No historical Hermes Trismegistus is known, and sayings passed round under his name are very often modern.
Sources and editorial method
This entry summarizes the tradition in the Almanac's own words; where no source is listed, it is an editorial summary rather than a primary text, and symbolic readings are named as the tradition's, not as fact.
- Source
- The Great Almanac Dictionary
- Category
- Mystical Systems
- Aliases
- thrice great hermes, hermes trismegistos, who was hermes trismegistus, hermes thoth, mercurius trismegistus
- Last updated
- 2026-09-26
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Common questions
Was Hermes Trismegistus a real person?
There is no evidence that he was. The name joins the Greek god Hermes with the Egyptian god Thoth, and the books written under it come from unknown authors in Roman Egypt.
What does Trismegistus mean?
It is Greek for thrice greatest. The title follows an Egyptian habit of calling the god Thoth great three times over, and it marked this Hermes off from the Greek god.
What did Hermes Trismegistus write?
Nothing that can be traced to one author. The works in his name include the Greek treatises of the Corpus Hermeticum, the Latin Asclepius, the Emerald Tablet and many handbooks of astrology and alchemy.
