Did Christmas Copy December 25 from Sol Invictus?
What the Ancient Evidence Actually Reveals
Every December, the claim resurfaces that Christmas is rooted in the Roman cult of Sol Invictus, the “Unconquered Sun,” and that Christians chose December 25 because it was already a pagan festival.
You’ve probably encountered some version of this argument on social media.
The story usually goes something like this: The Romans celebrated the birth of their sun god on December 25. Christians later adopted the same date for Jesus’ birth, replacing a pagan holiday with a Christian one.
It’s a straightforward explanation.
But is it historically accurate?
When we examine the surviving ancient evidence, the claim becomes considerably less certain than it’s often presented.
Early Christians associated December 25 with Jesus’ birth, possibly as early as the third century. Meanwhile, the earliest clear surviving calendar reference associating December 25 with the birthday of the Unconquered appears in a fourth-century Roman document.
That raises an interesting question.
Did Christians borrow December 25 from Roman paganism? Did pagan Romans respond to an existing Christian celebration? Or did the date develop through a combination of religious calculations and seasonal symbolism?
Let’s examine what we actually know.
Quick Answer: Did Christmas Come From Sol Invictus?
We do not have sufficient historical evidence to conclude that Christians chose December 25 because it was already an established festival of Sol Invictus.
The earliest clear surviving Roman calendar reference to the birthday of the Unconquered on December 25 appears in the Chronography of 354.
Christian evidence associating Jesus’ birth with December 25 may be considerably earlier. The writings of Hippolytus of Rome provide an important argument for an early third-century Christian calculation of that date.
Furthermore, early Christian chronological calculations offer a plausible explanation for December 25 that doesn’t require borrowing from pagan celebrations.
However, historians continue to debate the precise origins of the Christmas date.
The evidence challenges the popular claim that Christmas was simply copied from a pagan festival, but it doesn’t establish every detail of how December 25 became Christmas.
1. What Was Sol Invictus?
Sol Invictus means “Unconquered Sun.”
Solar worship existed in the Roman world long before Christianity, and the sun occupied an important place in Roman religion, symbolism, and imperial imagery.
During the third century, the emperor Aurelian significantly elevated the public worship of Sol.
In AD 274, he dedicated a temple to the sun god in Rome and promoted the cult as part of the empire’s religious life.
This much is historically well established.
But there’s an important distinction.
Evidence that Romans worshiped the sun doesn’t automatically establish that they celebrated the sun god’s birthday on December 25.
Those are two separate historical claims.
To demonstrate that Christians borrowed December 25 from Sol Invictus, we would need evidence that the pagan celebration existed on that date before Christians adopted it.
And that’s where the historical record becomes interesting.
What About Other Roman Festivals?
Rome had numerous religious celebrations throughout the year.
Saturnalia, for example, began on December 17 and eventually extended through December 23.
Other Roman festivals occurred throughout December and January.
The Romans also recognized the winter solstice, traditionally associated with December 25 in the Julian calendar.
However, the existence of winter festivals and solstice symbolism doesn’t, by itself, establish a pre-Christian December 25 birthday festival for Sol Invictus.
The question isn’t whether Romans celebrated during winter.
They did.
The question is whether an established pagan festival on December 25 can be shown to have influenced the Christian selection of that date.
2. What Is the Earliest Evidence for December 25 and Sol Invictus?
One of the most important historical documents in this discussion is the Chronography of 354.
This fourth-century Roman collection includes calendars, chronological information, and lists of important dates.
Its civil calendar contains an entry for December 25:
N INVICTI CM XXX
The entry is commonly understood as referring to the birthday of the Unconquered, accompanied by thirty chariot races.
Scholars generally associate the entry with Sol Invictus, although the abbreviated wording doesn’t explicitly spell out the sun god’s name.
This is the earliest clear surviving calendar evidence connecting December 25 with the birthday of the Unconquered.
But notice something important.
The document dates to AD 354.
That doesn’t mean the celebration necessarily began in 354.
It may have existed earlier.
However, the surviving evidence doesn’t establish precisely how much earlier it existed or whether it was already observed on December 25 before Christians associated the date with Jesus’ birth.
This is where popular explanations sometimes go beyond the evidence.
It’s frequently claimed that Aurelian established December 25 as the birthday of Sol Invictus in AD 274.
Aurelian certainly promoted solar worship in that year.
But the surviving evidence does not securely establish that he instituted a December 25 festival.
The distinction matters.
Aurelian’s promotion of Sol is documented.
The claim that he established a December 25 celebration is an additional historical inference.
We shouldn’t treat the two as though they’re equally established.
3. When Did Christians Begin Associating December 25 With Jesus’ Birth?
Here’s where the historical discussion becomes particularly interesting.
The same Chronography of 354 that contains the birthday of the Unconquered also preserves Christian calendar material.
A section commonly called the Depositio Martyrum identifies December 25 as the date of Christ’s birth in Bethlehem.
The Christian list is generally understood to preserve material from approximately AD 336.
This provides our earliest undisputed evidence for the observance of Jesus’ birth on December 25 in Rome.
But some evidence suggests Christians may have associated Jesus’ birth with that date much earlier.
Hippolytus of Rome
Hippolytus was an early Christian writer who lived during the late second and early third centuries.
A passage in his Commentary on Daniel identifies December 25 as the date of Jesus’ birth.
If that passage belongs to the original work, it would provide evidence that Christians associated Jesus’ birth with December 25 around the beginning of the third century.
However, scholars have debated whether the wording was part of Hippolytus’ original text or was added later.
That question shouldn’t be ignored.
But neither should the broader evidence from Hippolytus.
Additional Evidence From Hippolytus
In a 2015 study published in Vigiliae Christianae, scholar Thomas C. Schmidt examined chronological calculations in Hippolytus’ Canon and Chronicon.
Schmidt argued that these works provide independent evidence that Hippolytus calculated Jesus’ birth as December 25 around AD 235.
His argument draws on Hippolytus’ calculations concerning creation, the conception of Jesus, and the relationship between those events.
This is significant because it doesn’t depend solely on the disputed wording in Commentary on Daniel.
If Schmidt’s interpretation is correct, Christians were identifying December 25 as Jesus’ birthday well before our earliest clear surviving reference to the pagan festival on that date.
However, we need to distinguish two things.
Identifying December 25 as Jesus’ birthday isn’t necessarily the same as celebrating an annual Christmas festival on that date.
Hippolytus’ calculations may demonstrate an early Christian belief about the date.
They don’t independently establish that churches were already holding annual Christmas celebrations.
That distinction allows us to appreciate the significance of the evidence without overstating what it proves.
4. Why Would Christians Have Chosen December 25?
If Christians didn’t simply borrow December 25 from a pagan festival, where might the date have come from?
One important explanation involves early Christian chronological calculations.
Historians sometimes refer to this as the calculation theory.
The Connection Between Jesus’ Death and Conception
Some early Christians associated important events in Jesus’ life with particular calendar dates.
Around AD 200, Tertullian connected the date of Jesus’ crucifixion with March 25 in the Roman calendar.
Later Christian writers also associated March 25 with Jesus’ conception.
From there, the calculation is straightforward.
If Jesus was conceived on March 25, nine months later would be December 25.
This provides a possible explanation for how Christians arrived at the traditional Christmas date.
And it doesn’t require an existing pagan birthday celebration.
Was This Calculation Biblical?
We should make an important distinction here.
The Bible doesn’t tell us that Jesus was conceived on March 25 or born on December 25.
Those dates reflect later chronological and theological reasoning.
The Gospels provide details surrounding Jesus’ conception and birth, but they don’t identify the specific calendar day.
So the calculation theory isn’t proof that Jesus was actually born on December 25.
Instead, it helps explain how early Christians may have arrived at the date.
What About January 6?
There’s another interesting detail.
Some Eastern Christian traditions associated Jesus’ birth with January 6.
Scholars have noted that a similar chronological approach could connect an April 6 conception date with a January 6 birth.
This parallel is one reason historians take the calculation theory seriously.
It offers an explanation for two different early Christian birth dates through comparable reasoning.
Still, we shouldn’t claim that the theory has been proven beyond dispute.
It is a historically plausible explanation supported by early Christian chronological traditions.
It helps explain December 25 without requiring pagan borrowing, but the exact process by which the date became an annual Christian celebration remains uncertain.
5. What Do Modern Historians Say?
For many years, a popular explanation held that Christians selected December 25 to replace an existing pagan celebration of the sun.
That explanation remains influential.
However, several modern historians have challenged the assumption that the evidence establishes such a direct connection.
Steven Hijmans
Roman religion scholar Steven Hijmans examined the relationship between Sol Invictus, the winter solstice, and Christmas in a 2003 study.
His research challenged the assumption that a December 25 festival of Sol Invictus necessarily preceded Christmas.
Hijmans also explored the possibility that the pagan observance may have been established or emphasized in response to Christian use of the date.
However, that possibility remains a hypothesis rather than a demonstrated historical sequence.
His work is important because it shows that the familiar explanation of Christians copying a preexisting solar festival isn’t as secure as it’s often presented.
Andrew McGowan
Historian Andrew McGowan has also examined the origins of December 25.
He notes that the popular pagan-borrowing explanation encounters significant difficulties when compared with early Christian evidence.
McGowan gives serious consideration to the possibility that Christian chronological calculations, particularly those connecting Jesus’ death and conception, played an important role.
He also acknowledges that we cannot reconstruct every detail of how the Christmas date developed.
Thomas C. Schmidt
Schmidt’s work on Hippolytus adds another important piece to the discussion.
If Hippolytus’ chronological calculations point to December 25 around AD 235, then Christians were associating Jesus’ birth with that date earlier than some older explanations allowed.
That strengthens the case for an independent Christian origin of the date.
However, scholars continue to debate the interpretation and significance of the evidence.
Is There a Scholarly Consensus?
We should be careful with that word.
There is no reason to claim that historians unanimously agree Christians chose December 25 first or that pagan Romans copied the Christian celebration.
The historical evidence doesn’t establish that degree of certainty.
What we can say is that the traditional explanation of Christmas as a straightforward replacement for an established pagan December 25 festival has faced substantial scholarly criticism.
The calculation theory provides a serious alternative.
And the surviving evidence leaves important questions unresolved.
6. Could Sol Invictus Have Borrowed December 25 From Christians?
This possibility is worth considering.
If Christians associated Jesus’ birth with December 25 before a pagan celebration was established on that date, it’s possible that the later pagan observance developed in response.
That would reverse the popular explanation.
Instead of Christians borrowing from pagan Rome, pagan religious authorities might have responded to Christian use of the winter solstice.
Some scholars have raised this possibility.
However, we need to be equally careful with this argument.
We don’t possess sufficient evidence to demonstrate that Roman authorities deliberately adopted December 25 to compete with Christianity.
The chronology of our surviving sources makes the hypothesis possible.
It doesn’t prove it happened.
It’s also possible that Christian and pagan uses of the date developed independently because both traditions found significance in the winter solstice.
Or the relationship may have involved cultural interaction that our surviving sources don’t fully reveal.
The evidence doesn’t allow us to settle those possibilities with certainty.
So while the idea of pagan Rome responding to Christianity is interesting, I wouldn’t present it as an established historical conclusion.
7. Why Does the Pagan-Origin Claim Continue to Circulate?
Part of the explanation is that the argument sounds reasonable.
The Romans worshiped the sun.
December 25 was associated with the winter solstice.
Christians eventually celebrated Jesus’ birth on December 25.
Therefore, Christians must have borrowed the date from Roman sun worship.
But that final step is an inference.
And it requires evidence.
Similarity Doesn’t Establish Borrowing
Two religious traditions can share a date or symbol without one necessarily copying the other.
To demonstrate historical borrowing, we need evidence that one tradition existed first and influenced the other.
That evidence might include contemporary explanations, records of deliberate changes, or other reliable historical testimony.
Without such evidence, we should avoid presenting a plausible theory as an established fact.
Popular Claims Often Simplify Complicated History
Another reason these claims circulate is that simple explanations are easier to share.
A social media graphic can declare that Christmas was stolen from paganism in a single sentence.
Explaining the historical evidence takes considerably longer.
We have to discuss ancient calendars, the development of Christian celebrations, early chronological calculations, and the limitations of surviving sources.
But historical accuracy requires that additional work.
An explanation shouldn’t become a historical fact simply because it has been repeated often enough.
And that principle applies equally to Christian and non-Christian arguments.
8. Does It Matter If December 25 Was Influenced by Pagan Celebrations?
There’s another question worth considering.
Suppose historians eventually established that Christians intentionally selected December 25 because of an existing Roman celebration.
Would that mean the biblical account of Jesus’ birth was borrowed from pagan mythology?
No.
Those are two different historical questions.
One concerns when and why Christians began commemorating Jesus’ birth on a particular calendar date.
The other concerns the historical origins of the Gospel accounts themselves.
Matthew and Luke were written centuries before the fourth-century Roman calendar evidence we’ve been discussing.
Neither Gospel identifies December 25 as Jesus’ birthday.
Therefore, even if the later selection of December 25 involved interaction with Roman religious customs, that wouldn’t establish that the Gospel accounts were copied from pagan myths.
It also wouldn’t settle the separate theological question of whether Christians should celebrate Christmas.
I’ve explored that issue in greater detail in Is Christmas Wrong to Celebrate Because It Has “Pagan Roots?”.
For a closer examination of the relationship between December 25 and Roman solar worship, see Was December 25 the Date of Sol Invictus Before Nicaea? Does It Change Anything?.
Key Takeaways
1. Roman sun worship existed long before Christianity. However, that doesn’t establish that December 25 was already celebrated as the birthday of Sol Invictus.
2. The earliest clear surviving calendar reference to the birthday of the Unconquered on December 25 appears in the Chronography of 354. This establishes that the date was recognized in the fourth century, but not when the observance originally began.
3. Christian evidence associating Jesus’ birth with December 25 may be earlier. Hippolytus’ writings and chronological calculations are particularly important to this discussion.
4. The calculation theory provides a plausible independent explanation for December 25. Early Christian associations between Jesus’ death, conception, and birth may help explain how the date developed.
5. The claim that Christians simply copied December 25 from an established pagan festival is not historically demonstrated. However, the precise origins of the date remain debated.
6. The Bible doesn’t identify December 25 as Jesus’ birthday. The historical question of why Christians chose that date is separate from the Gospel accounts of His birth.
Conclusion: What Does the Evidence Actually Show?
So, did Christmas come from Sol Invictus?
The surviving historical evidence does not establish that Christians borrowed December 25 from an earlier festival of the Roman sun god.
That’s an important conclusion.
The popular explanation is frequently presented as though historians have definitively demonstrated that Christians copied an existing pagan holiday.
But the evidence is more complicated.
Christian chronological calculations may have associated December 25 with Jesus’ birth as early as the third century.
The earliest clear surviving calendar reference to the birthday of the Unconquered on December 25 comes from the fourth century.
And early Christian theological calculations provide a plausible explanation for the date that doesn’t depend on pagan borrowing.
Does that prove Christians were the first to use December 25 for a religious celebration?
No.
Does it prove pagan Romans copied the date from Christians?
No.
But it does mean we should be skeptical of claims that Christmas was unquestionably copied from Sol Invictus.
The historical evidence supports a more careful conclusion than either side of the debate sometimes allows.
And perhaps that’s the most important lesson.
When we investigate claims about Christianity, our goal shouldn’t be to defend a particular explanation simply because it supports what we already believe.
Our goal should be to understand what the evidence actually tells us.
Sometimes that means correcting popular misconceptions.
Sometimes it means acknowledging uncertainty.
And sometimes it means recognizing that the historical record doesn’t allow us to answer every question.
As Christians, we don’t need to exaggerate historical evidence to defend our faith.
The Bible never tells us to celebrate Jesus’ birth on December 25.
But it does tell us that Jesus was born, that He came as the promised Savior, and that His coming was good news for the world.
That’s the truth Christians celebrate at Christmas, regardless of the date on the calendar.
Related MTSM Resources
Was December 25 the Date of Sol Invictus Before Nicaea? Does It Change Anything?
A closer examination of the historical evidence connecting December 25 with Roman solar worship.
Did Christmas Come From Saturnalia?
Exploring the relationship between Christmas and Rome’s Saturnalia celebrations.
Is Christmas Wrong to Celebrate Because It Has “Pagan Roots?”
Examining the biblical and historical questions surrounding Christmas celebrations.
A broader examination of common claims about Christmas and pagan traditions.
Sources and Further Reading
Primary historical evidence
- Chronography of 354, civil calendar and Depositio Martyrum. The calendar contains the December 25 entry for the birthday of the Unconquered, while the Christian material identifies the same date with Jesus’ birth in Bethlehem.
- Hippolytus of Rome, Commentary on Daniel 4.23. The passage associates Jesus’ birth with December 25, although its textual history has been debated.
- Hippolytus, Canon and Chronicon. Chronological calculations in these works have been examined as possible evidence for an early third-century Christian association of December 25 with Jesus’ birth.
- Tertullian, Against the Jews 8. Early Christian chronological reasoning concerning the date of Jesus’ crucifixion.
- Augustine, On the Trinity 4.5.9. Discusses the traditional association of March 25 with Jesus’ conception and December 25 with His birth.
Modern historical scholarship
Michele Renee Salzman, On Roman Time: The Codex-Calendar of 354 and the Rhythms of Urban Life in Late Antiquity (University of California Press, 1990). A scholarly examination of the Roman calendar and its historical context.
Steven Hijmans, “Sol Invictus, the Winter Solstice, and the Origins of Christmas,” Mouseion 47 (2003). Examines Roman solar worship, the winter solstice, and the historical evidence surrounding Christmas.
Thomas C. Schmidt, “Calculating December 25 as the Birth of Jesus in Hippolytus’ Canon and Chronicon,” Vigiliae Christianae 69 (2015): 542–563. Presents evidence for an early third-century Christian calculation of December 25.
Andrew McGowan, “How December 25 Became Christmas,” Biblical Archaeology Review. Discusses the pagan-borrowing explanation, the calculation theory, and the historical development of Christmas.
Thomas J. Talley, The Origins of the Liturgical Year (Liturgical Press, 1991). A major study of the historical development of Christian feast days and liturgical calendars.
Thomas C. Schmidt — Original 2015 scholarly article (PDF)
Andrew McGowan — How December 25 Became Christmas
Steven Hijmans — Sol Invictus, the Winter Solstice, and the Origins of Christmas