One of the most persistent myths about the Bible is that the Council of Nicaea in 325 CE decided which books to include. The historical record shows otherwise. The First Council of Nicaea — convened by Emperor Constantine in the city of Nicaea (modern Iznik, Turkey) — addressed a theological crisis about the nature of Christ, produced a creed, standardized the date of Easter, and dealt with church governance. It did not vote on, discuss, or determine which books belong in the Bible.
This misconception has become so widespread that it functions almost as common knowledge — repeated in documentaries, online forums, and popular histories as though it were established fact. But the actual history of how the biblical canon took shape is more gradual, more decentralized, and more interesting than any single-council narrative. The real story involves centuries of community practice, competing lists, regional councils that disagreed with each other, and a consensus that was never fully universal.
What the Council of Nicaea Actually Addressed
The First Council of Nicaea was convened in 325 CE by Emperor Constantine, who had recently unified the Roman Empire and sought to resolve divisions within Christianity that threatened political stability. Approximately 300 bishops attended — most from the eastern half of the empire — making it the first ecumenical (empire-wide) council in Christian history.
The central issue was the Arian controversy. Arius, a priest in Alexandria, taught that the Son of God was a created being — divine, but not co-eternal with God the Father. “There was a time when the Son was not,” Arius argued, a position that struck at the heart of emerging trinitarian theology. His bishop, Alexander of Alexandria, considered this heretical, and the dispute had spread across the eastern Mediterranean.
The council’s response was the Nicene Creed, which affirmed that Christ was “of one substance” (homoousios) with the Father — a direct rejection of Arius’s position. The creed established what would become orthodox Christian theology on the nature of Christ, though the debate was far from settled. Arian and semi-Arian positions persisted for decades, and subsequent emperors alternately supported and opposed the Nicene position. The theological question Nicaea addressed — the relationship between God the Father and God the Son — was a question about doctrine, not about which texts were authoritative. The historian Eusebius of Caesarea, who attended the council, recorded its proceedings and makes no mention of any discussion about which books should be considered biblical.
Beyond the Arian controversy, the council addressed the dating of Easter (standardizing it across communities that had been celebrating on different dates), the readmission of Christians who had renounced their faith during persecution, and various matters of church organization and discipline. The council produced 20 canons — formal rules — none of which concern the contents of the Bible.
Constantine’s role in convening the council has also been misunderstood. He provided the venue, funded travel for bishops, and presided over the opening sessions, but he did not dictate theological outcomes. His interest was unity: a divided church was a political liability for an emperor who had staked his legitimacy on Christian support. The theological positions adopted at Nicaea were driven by bishops — particularly Alexander of Alexandria and his deacon Athanasius, who would later become one of the most important figures in the history of the biblical canon, though for reasons unrelated to this council.
How the Misconception Spread
The idea that Nicaea decided the biblical canon gained popular traction through Dan Brown’s 2003 novel The Da Vinci Code, in which a character claims that Constantine “collated the Bible” and that Nicaea voted on the divinity of Jesus by a “relatively close vote.” Both claims are historically inaccurate — the vote against Arianism was overwhelming, and the canon was not on the agenda.
But the misconception predates Brown. It draws on a vague cultural narrative in which “the Church” at some specific historical moment “chose” which books to include and which to exclude — often with the implication that the process was politically motivated and that important texts were suppressed. This narrative conflates several different historical developments: the canon formation process, the Christological debates of the 4th century, and the suppression of texts deemed heterodox.
Bart D. Ehrman, a leading scholar of early Christianity at the University of North Carolina, has addressed this misconception directly: the Council of Nicaea “had nothing to do with forming the biblical canon.” The historical records of the council — including the accounts of Eusebius, the council’s canons, and the creedal documents — contain no reference to a vote on biblical books.
The persistence of the myth is itself instructive. It reflects a desire for a clean, dramatic origin story — a single moment when powerful figures sat down and decided what counts as the Bible. The actual history is less cinematic but more revealing: the canon emerged through the accumulated decisions of hundreds of communities over centuries, shaped by factors that ranged from theological conviction to geographic proximity to the practical availability of manuscripts. Understanding the real process means letting go of the single-council narrative and recognizing that the Bible’s boundaries were drawn gradually, contested repeatedly, and defined differently by different traditions.
Which Councils Did Influence the Canon?
If Nicaea did not decide the canon, who did? The answer is that no single council or authority made the decision. The biblical canon emerged through a gradual process of community usage, bishop lists, and regional council declarations spanning several centuries.
Athanasius’s 367 CE Easter Letter. Athanasius, Bishop of Alexandria, included in his annual Easter letter a list of texts he considered canonical. This is the first known document that lists exactly the 27 books of the modern New Testament. Athanasius’s list was influential but not universally adopted — other communities continued to debate specific books, particularly Hebrews, Revelation, and the shorter Catholic epistles.
Council of Hippo (393 CE). This regional council in North Africa affirmed a canon list that largely matches the modern Catholic Bible, including the deuterocanonical books. The council’s records survive only through later references, but its list was significant as an early formal endorsement.
Council of Carthage (397 CE). Another North African council ratified a list similar to Hippo’s. Together, Hippo and Carthage represent the earliest conciliar endorsements of a biblical canon — but both were regional councils, not ecumenical ones, and their lists were not binding on all Christian communities.
Council of Trent (1546 CE). More than a millennium later, during the Protestant Reformation, the Catholic Church formally defined its canon at the Council of Trent. This included the deuterocanonical books — texts like Tobit, Judith, Wisdom of Solomon, and Sirach that Protestants had excluded following Martin Luther’s preference for the Hebrew Bible over the Septuagint as the basis for the Old Testament. Trent’s definition was itself a response to Protestant challenges — Martin Luther had questioned the canonicity of several books, including James (which he famously called “an epistle of straw”) and Revelation.
The gap between the composition of the last New Testament texts (~120-150 CE) and Trent’s formal definition (1546 CE) spans more than 1,300 years — a reminder that “the biblical canon” was an evolving concept for most of Christian history. The Eastern Orthodox churches followed yet another path, with the Synod of Jerusalem in 1672 CE affirming a canon that includes texts absent from both the Protestant and Catholic collections.
The Gradual Consensus: How Texts Became Canonical
The process by which specific texts gained canonical authority was not top-down but bottom-up. Communities read certain texts in worship, copied them, circulated them, and gradually came to treat them as authoritative — long before any council issued a formal list.
Several factors influenced which texts gained widespread acceptance. Perceived apostolic origin was significant: texts attributed to apostles or their close associates carried more weight. The Gospel of Mark, for example, was traditionally linked to Peter through Mark’s role as Peter’s interpreter. Consistency with emerging orthodox theology mattered — texts that aligned with the developing consensus on core doctrines were more likely to be accepted. Widespread usage across multiple communities served as a kind of practical vote: a text read in churches from Rome to Alexandria to Antioch had stronger claims to canonical status than one known only in a single region.
Eusebius of Caesarea, writing his Church History around 325 CE (the same year as the Council of Nicaea), categorized New Testament texts into three groups: “recognized” books accepted by most communities, “disputed” books accepted by some but not all, and “rejected” books considered inauthentic. His disputed category included James, Jude, 2 Peter, 2 and 3 John, and sometimes Revelation — texts that eventually made it into the canon but whose status was not yet settled in the early 4th century.
Antiquity also played a role. Texts believed to come from the apostolic era carried more weight than texts perceived as recent compositions. This is one reason pseudepigraphic works (texts composed in the name of an earlier, revered author) were common in the ancient world — attributing a text to Paul or Peter was not simply deception but a literary convention that signaled continuity with apostolic tradition. When later communities judged that a text was not genuinely apostolic, that judgment could influence its canonical status — though the process was rarely straightforward.
Harry Gamble, in his study of early Christian book culture, has shown that the physical format of texts also mattered. The shift from scrolls to codices (bound books) in early Christianity made it possible — for the first time — to gather multiple texts into a single physical volume. This practical development created the conditions for thinking about “the Bible” as a unified collection, rather than a set of separate scrolls read individually.
The question of who decided what is in the Bible has no single answer because the process had no single decision-maker. It was a collective, centuries-long negotiation — shaped by theology, politics, liturgical practice, and the practical needs of communities that needed to know which texts to read, copy, and teach.
What This Means for Reading the Bible
Understanding that the biblical canon was assembled gradually — and that the Council of Nicaea played no role in that process — reframes how we understand the Bible as a collection. The 66 books of the Protestant Bible (or 73 in the Catholic tradition, or 81 in the Ethiopian Orthodox) were not handed down as a pre-assembled package. They were selected, debated, and ratified over centuries by communities working with the theological and literary tools available to them.
The texts that were excluded — the books that were removed from the Bible, or more precisely, the texts that were never universally included — were composed in the same world as the canonical writings. The Gospel of Thomas preserves sayings attributed to Jesus in a form that some scholars believe predates parts of the canonical Gospels. The Book of Enoch shaped the apocalyptic imagery found in Revelation and is explicitly quoted in the canonical letter of Jude. The Didache, a manual of early Christian practice, was read in worship alongside texts that became canonical — Athanasius himself listed it as useful for instruction, even while excluding it from his canonical list. The Shepherd of Hermas was included in the Codex Sinaiticus, one of the oldest surviving complete New Testament manuscripts, composed in the 4th century CE.
The line between “in” and “out” was drawn by communities over time, not by a single vote at a single council. And as the deuterocanonical books demonstrate — present in Catholic and Orthodox Bibles, absent from Protestant ones — that line has never been drawn in exactly the same place by all Christians.
The history of the Bible is the history of these choices — and understanding who made them, when, and why changes how the collection reads. If you want to encounter these texts with that kind of context — who composed them, when, and the historical circumstances that shaped them — Uncanon provides scholarly framing before every passage, organized in the order the texts were actually composed.