The first thing to know about the gnostics is that there was no such thing as “the gnostics.”
That sounds like a paradox, and it is the most important paradox to start with, because almost everyone arrives at this material with the wrong mental picture. The popular image is of a single secret society — a unified counter-church operating in the shadows of orthodox Christianity, all believing the same things, all practicing the same rites. That picture is wrong, and it’s the reason most popular accounts of “the gnostics” feel slightly off. They’re describing a coherent religion that never existed.
What did exist, in the Mediterranean world of the 2nd and 3rd centuries, was something much more interesting: a family of distinct communities, with rival teachers and competing cosmologies, sharing a small set of profound convictions and disagreeing on almost everything else. These people had names. They had cities. They had schools and bishops and feast days. Some of them, you would have walked past in a market in Alexandria or Rome or Antioch without knowing it. Some of them attended the same church services as their “orthodox” neighbors and went home to a second, deeper meeting afterward. This article is about who they actually were.
The word “gnostic” is a category, not a sect
Start here, because the word itself causes most of the confusion. Gnostikos in Greek means something like “one who knows” — pertaining to gnosis, direct knowledge. (For the meaning of gnosis itself, see What Is Gnosis?.)
Early Christian writers used “gnostic” loosely, as a kind of insult, to lump together a wide range of teachers and groups they considered heretical. Modern scholars use it more carefully — as a category covering communities that share certain features: a higher unknowable God above the creator of this world, a flawed material cosmos built by a lesser power, a divine spark inside the human being, and salvation through direct inner knowing. But within that category there were real, deep, sometimes vicious disagreements. Calling them all “gnostics” is a bit like calling someone “a Protestant” today — accurate at the broadest level, almost useless if you want to know what they actually believe on a Sunday morning.
So a better question than “who were the gnostics?” is: who were the major gnostic schools, what did each one teach, and how did they differ? That’s a question we can actually answer.
The Valentinians
If gnosticism had a Renaissance court, it was the school of Valentinus. He is the most important figure in the entire gnostic tradition, and the one whose story most disturbs the cliché that gnostics were obscure heretics on the fringes.
Valentinus was born around 100 CE in Egypt. He was educated in Alexandria — the great intellectual center of the ancient world, where Greek philosophy, Jewish thought, and Christian theology all sat in one library. He moved to Rome around 136 CE, where he taught for roughly fifteen years and built a substantial following. And here’s the detail that’s stranger than fiction: according to the orthodox church father Tertullian, Valentinus was almost elected Bishop of Rome. He was a serious candidate. When another man, Anicetus, was chosen instead in 155 CE, Valentinus eventually parted ways with the mainstream church and devoted himself to teaching his own school.
Read that again, because it changes the picture. The man whose theology the church would spend centuries trying to erase came within an election of being Pope. He wasn’t an outsider attacking Christianity from the wilderness; he was an insider whose ideas the institution couldn’t quite contain.
Valentinian theology is the most sophisticated of the gnostic systems. They taught an elaborate divine realm — the Pleroma — populated by thirty Aeons in male-female pairs. They had five sacraments, including the mysterious “bridal chamber” rite covered in the Gospel of Philip. And they had a distinctive position on the material world that set them apart from other gnostics: rather than seeing matter as pure prison, the Valentinians believed the awakened person’s task was to be light within the world, illuminating it from inside rather than fleeing it. That’s a meaningfully different temperament from groups that emphasized escape.
The Valentinians were also, by some accounts, organizationally integrated. There is a real possibility that many of them attended mainstream church services and their own secret meetings — leading a dual religious life that wouldn’t have looked, on the surface, like membership in a “gnostic sect” at all. You might have sat next to one at a 2nd-century eucharist and never known.
The Sethians
The Sethians are the other great current of 2nd-century gnosticism, and they were doing something distinctly different from the Valentinians.
Where Valentinian thought drew heavily on Greek philosophy and Christian sacraments, Sethian thought grew out of Hellenistic Judaism — a fusion of Jewish wisdom traditions, Christian themes, and Middle Platonism. The Sethians took their name from Seth, the third son of Adam and Eve in Genesis, whom they understood as the perfect human and a kind of redeemer figure — the ancestor of a “holy race” of spiritually awakened people. They saw themselves, in some sense, as Seth’s descendants: the offspring of the divine spark that survived the fall.
If you want to read what the Sethians were actually thinking, the place to go is the Apocryphon of John, which is essentially the Sethian master text. The cosmology there — Monad, Barbelo, Sophia’s fall, Yaldabaoth’s blind creation, the trapping of the spark — is the Sethian system in its most developed form. Where the Valentinians spoke of awakening within matter, the Sethians were more emphatic about escape from matter, the soul’s ascent past the Archons, the long journey back to the divine realm above.
The Sethians were not as organizationally visible as the Valentinians. We don’t have a Sethian “Valentinus” — no single named founder, no almost-bishop, no clear school in Rome. They were more dispersed, more text-centered, more focused on the cosmic story than on running a community. But they produced an enormous body of literature, much of which is preserved in the Nag Hammadi codices, and their cosmology is the one most people mean when they say “the gnostic worldview.”
The Basilideans
A third major school orbited the teacher Basilides, who taught in Alexandria sometime before 150 CE. Basilides was, like Valentinus, a serious and sophisticated thinker, and his system was distinctive enough to mark his followers as a separate group.
The Basilideans held that there were three classes of human beings — material, intellectual (or “psychic”), and spiritual — and that salvation was structured according to this hierarchy. Spiritual humans, who possessed the divine spark in its most awake form, could attain the highest knowledge; intellectual humans could achieve a lesser salvation through faith; material humans were tragically bound to the lower realm. (This is the rougher edge of gnostic teaching, and it’s part of why the orthodox found these groups so disturbing — it sounded like a doctrine of spiritual castes.)
Basilides also taught some genuinely strange and provocative ideas. He held, for example, that Jesus did not actually suffer and die on the cross — that at the crucial moment, Jesus and Simon of Cyrene (the man who, in the canonical gospels, helps carry the cross) switched appearances, and it was Simon who was crucified while Jesus stood by laughing. This docetic view — that Christ’s body was illusory — was a recurring temptation in gnostic thought, and it’s one of the points where orthodox theology drew hard lines against gnostic teaching.
Basilides’s school also reportedly required new initiates to observe five years of silence before being taught the deeper mysteries — a practice borrowed, probably, from Pythagorean philosophical schools. Joining the Basilideans was joining something serious; not casual seekers.
The Thomas Christians
A fourth thread — and one scholars sometimes consider less fully “gnostic” than the others — gathered around the apostle Thomas.
The Thomas Christians (sometimes called Thomasines) were less a single sect than a loose tradition that produced and treasured a set of texts attributed to Didymus Judas Thomas, “the twin.” The most famous is the Gospel of Thomas, but there were others: the Book of Thomas the Contender, the Acts of Thomas, and the gorgeous narrative poem called the Hymn of the Pearl. The community, or family of communities, that produced this literature was probably based in Syria — possibly around Edessa — and active from the early 2nd century onward.
What makes the Thomasines a bit different is that their literature, while sharing themes with gnostic thought (inner knowledge, the kingdom within, the divine spark), is generally less developed mythologically than what you find in Sethian or Valentinian texts. There’s no elaborate Pleroma, no detailed account of Sophia’s fall, no named Archons. Some scholars argue the Thomasines represent an earlier, simpler stratum of gnostic-adjacent Christianity — a tradition that may go back closer to the first century, before the developed mythologies took shape. Others argue they shouldn’t be called gnostic at all, but are simply a third stream of early Christianity that the orthodox eventually edited out.
Either way, they belong in this catalog because the texts they produced are some of the most important in the corpus, and the Gospel of Thomas in particular preserves what may be very old material.
And around the edges
These four schools — Valentinians, Sethians, Basilideans, Thomasines — are the most important and best-documented. But the actual landscape was wider.
There were the Marcionites, followers of Marcion of Sinope (c. 85-160 CE), who weren’t technically gnostic but were adjacent in important ways: he taught that the God of the Hebrew Bible was a different, inferior deity from the God revealed by Jesus, and he tried to canonize a Christian Bible that excluded the Old Testament entirely. The orthodox church considered him one of its most dangerous opponents, alongside Valentinus and Basilides.
There were the Mandaeans, a Jewish-Christian gnostic-influenced group focused on baptism and the cosmic struggle between light and darkness — and remarkably, they still exist today, primarily in Iraq and Iran, making them the only surviving ancient gnostic community in the world.
There were the Elcesaites, another Jewish-Christian group that influenced later figures including, possibly, the founder of Manichaeism. There were the Carpocratians, the Ophites (named for their veneration of the serpent in Eden), the Cainites, and many others. Some of these are known only from hostile descriptions by orthodox writers, and we can’t always tell how much was real teaching and how much was polemical fiction.
The point isn’t to memorize the list. The point is that “gnosticism” was a forest, not a tree — many overlapping growths sharing a kind of soil, distinct in their forms, sometimes hostile to one another, all eventually felled by the same wind when the orthodox church consolidated its power.
Where they actually were
These weren’t just texts. They were people, in places, doing things.
Alexandria was the great gnostic intellectual center — Basilides taught there, Valentinus was educated there, and the city’s blend of Greek philosophy, Jewish scripture, and Christian theology produced more gnostic thought than anywhere else. Rome received Valentinus and his school. Syria likely birthed the Thomas tradition. Egypt preserved much of what we have, including, eventually, the Nag Hammadi library buried in a jar in the desert. Communities also existed in Asia Minor (modern Turkey), where Irenaeus encountered Valentinians firsthand and wrote his great refutation against them.
These communities had practices. The Valentinians had their five sacraments. Some groups practiced strict asceticism — celibacy, fasting, withdrawal from civic life. Others (the orthodox accused) practiced ritual that scandalized outsiders, though much of this is hostile rumor and probably exaggerated. Some met in private homes; some had teachers running schools; some, like the Mandaeans, became coherent ethnic-religious communities that persisted for centuries.
Why orthodoxy could not coexist with them
What finally happened to these communities is a story for another piece. But the basic logic of their suppression follows from what they actually believed.
If salvation comes through direct inner knowing — through gnosis — then no institution is ultimately necessary between you and God. No bishop is essential. No apostolic succession is the only channel of grace. The whole architecture of the consolidating orthodox church, with its hierarchy and its sacraments and its claim to be the exclusive vehicle of the true teaching, becomes optional at best. That isn’t a small theological disagreement. That is two incompatible answers to the question of how spiritual authority works.
So the orthodox writers — Irenaeus around 180 CE, Tertullian, Hippolytus, Epiphanius — went after the gnostics with everything they had. Long treatises were written explicitly to refute them: Irenaeus’s Against Heresies runs five books and is largely an attack on Valentinian teaching. By the time the Roman Empire became Christian under Constantine in the early 4th century, the orthodox church had the political power to do more than write treatises. Gnostic books were destroyed. Gnostic communities were pushed out, scattered, in some cases prosecuted. By the 5th century, organized gnosticism in the Mediterranean had been effectively erased — its memory preserved mostly in the hostile descriptions of its enemies, until a jar in the Egyptian sand gave some of it back in 1945.
Real people, not symbols
If you take only one thing from this article, take this: the gnostics were people. They had names. They had biographies — Valentinus the brilliant near-bishop, Basilides the Alexandrian teacher with his five-year silences, the unnamed Sethian author writing the Apocryphon of John in some house in some city. They argued with each other. They built communities. They raised children, kept houses, made livings, attended worship. They were neighbors to other Christians and other Jews and other Romans and Greeks and Egyptians.
And then they were largely erased. Not because their ideas were stupid — many of their ideas were sophisticated enough that the smartest minds of the orthodox church spent decades writing against them — but because the institution that would inherit Western religious history could not accommodate the claim at the center of their teaching: that you don’t need an institution to find God. That gnosis is firsthand. That the home of the spark inside you is the same direction as the highest reach of the divine, and no one else can take you there.
The fact that we are reading them now — that their texts survive, that their names are spoken, that this site exists — is the part of the story they would have called anamnesis. Remembering. The light coming back to something that had forgotten itself.
The Gnostic Guide explores ancient gnostic texts and ideas for a modern audience. New here? Start with What Is Gnosticism?, or read the texts these communities left us: the Apocryphon of John (Sethian), the Gospel of Philip (Valentinian), and the Gospel of Thomas (Thomasine).
Frequently Asked Questions
Who were the gnostics in simple terms?
The gnostics were a diverse family of religious communities — mostly Christian, some adjacent to Judaism — that flourished in the Mediterranean world during the 2nd and 3rd centuries CE. They shared a few core convictions: that there is a true God above the creator of the material world, that the human soul carries a divine spark from that higher source, and that salvation comes through direct inner knowledge (gnosis) rather than faith or institutional authority. There was never a single 'gnostic church.'
Were the gnostics Christians?
Most were. The major gnostic schools — the Valentinians, Sethians, Basilideans, and Thomas Christians — operated within the wider Christian world of the 2nd century, used Christian scriptures, revered Christ as the revealer of the true God, and practiced Christian sacraments. Some scholars argue many gnostics attended mainstream churches alongside their own meetings. They were eventually pushed out as orthodoxy consolidated, but they began as a current within Christianity, not outside it.
What were the main gnostic schools?
The four most important were: the Valentinians (followers of Valentinus, c. 100-180 CE, a brilliant teacher who almost became Bishop of Rome); the Sethians (a Jewish-Christian current centered on Seth, the third son of Adam, as a redeemer figure); the Basilideans (followers of Basilides in Alexandria, before 150 CE); and the Thomas Christians (gathered around texts attributed to the apostle Thomas, like the Gospel of Thomas). Each had its own distinct cosmology, scriptures, and practices.
Did the gnostics have churches?
Some did. The Valentinians especially had sophisticated communities with their own sacraments — baptism, anointing, eucharist, redemption, and the bridal chamber. Other groups had schools rather than congregations, more like philosophical academies. Evidence is uneven, but the gnostics were not, as is sometimes claimed, a single secret society. They were multiple movements with different organizational forms.
Why were the gnostics suppressed?
Their teachings threatened the structure of the consolidating orthodox church. If salvation comes from direct inner knowledge rather than from faith mediated through bishops and sacraments, then the entire apparatus of apostolic authority becomes optional. The church fathers — Irenaeus especially — wrote major treatises attacking gnostic teachings, and as orthodoxy gained political power in the 4th century, gnostic texts were destroyed and their communities pushed to the margins or out of existence.