Back in early 2024, I did a series of posts on a group commonly known as the Quartodecimans. The Quartodecimans were Christians, mainly from the east, who are best known because they emphasized that the Last Supper should be observed annually, on the date of Nisan 14 whenever possible. This led to the "Quartodeciman Controversy". I started out that series by saying any good discussion on Easter ought to mention the Quartodecimans. And it should!
But I bet you didn't know any good discussion on Christmas should mention them, too.
The Quartodecimans celebrated Christmas?? Well, perhaps some did, but not overall. They celebrated the nativity of our Lord, yes, but not usually on December 25 as Christmas. Instead, they celebrated it on January 6 as Epiphany.
Let's go on an adventure and see how the Quartodecimans were involved with Epiphany.
TOOLBOX
There are some things you are going to need to know in order to fully understand today's post. Tools to work with, so to speak. I usually assume people read my other articles, but I will summarize to save you time. Skip this if you're already familiar.
The first thing you will need to know is Epiphany.
Epiphany started in the eastern church as a memorial of our Lord's incarnation and birth. Same idea as Christmas, but on a different date. Later, it was decided Christmas would honor the nativity, and Epiphany became the day to honor major events of Jesus' life including the arrival of the Magi, His baptism, and the wedding at Cana. That's how things are to this day in Catholic and Orthodox churches, but Epiphany has been mostly abandoned by Protestants (which is why I'm explaining it in the first place).
The second thing you will need to know is "integral ages".
The ancient Jews had an unusual idea where multiple important events happen on the same date. These are called "integral ages". In the minds of the ancient Jews, important people were believed to have been conceived or born on the same date on which they died. I know this sounds odd, but you must understand that, whether it's true or not, it is built on quite a lot of evidence.
The third thing you will need to know is Calculation Theory (CT).
CT is a theory about how the date for the nativity of Christ was originally chosen. According to CT, Christian scholars came to the date on their own through calculations. They first determining the date of His crucifixion, then used integral ages to reach the birth. Hippolytus championed March 25, and that date caught on in the west. In the east, however, the popular date was April 6. Today's post is mostly going to be about this April 6 date.
Now, you add in integral ages, and you get Jesus being conceived on a certain date (March 25 / April 6), then nine months later comes His nativity (December 25 / January 6).
Now that you are fully armed and operational, let's dive into April 6.
PIECES OF APRIL
I am going to give you both scholarly references and plain explanations here.
In the early 200s, calendar issues were taking the spotlight. Many Christians were attempting to determine when the crucifixion occurred, and for several reasons. Everyone knew Passover was Nisan 14, yet it was becoming clear there was an issue with the Jewish calendar - Nisan 14 was no longer reliably anchored to the start of spring following the Bar Kokhba revolt. Correcting Nisan 14, then converting that into the other calendars in the empire, was quite difficult. At the same time, there were theological debates that needed answers, such as the human and divine natures of Jesus. And then, there were natural curiosities, such as Hippolytus trying to find every Passover back to the 4th day of creation. The answer to all of these was to calculate dates.
We know Christian scholars were calculating dates because we have the written evidence. In the west, Tertullian and Hippolytus converted Nisan 14 in the Jewish calendar to March 25 in the Julian calendar.
That is not how they did it in the east.
"In the East, too, the dates of Jesus’ conception and death were linked. But instead of working from the 14th of Nisan in the Hebrew calendar, the easterners used the 14th of the first spring month (Artemisios) in their local Greek calendar—April 6 to us. April 6 is, of course, exactly nine months before January 6 - the eastern date for Christmas."
-Biblical Archaeology Review, "How December 25 Became Christmas", 7-10-2025.
Please allow me to explain this more plainly.
Eastern Christians used a completely different calendar than the Jews or the western Christians - the Macedonian lunar calendar. They took the idea behind Nisan 14 (the fourteenth day of the first Jewish spring month) and replaced it with their equivalent (the fourteenth day of their own first spring month). Thus, Nisan 14 was traded for Artemisios 14. This was not a date-to-date swap, but an idea-to-idea swap. (Artemesios 14 and Nissan 14 would not usually be on the same day, but they are always the 14th day of the first spring month.)
Later, others converted Artemisios 14 into April 6 in the Julian calendar. (If you're interested, Thomas Talley explains how that worked on page 8 of his book "Origins of the Liturgical Year". But that's not important right now.)
This is the majority scholarly consensus on what they did. Understand that this is circumstantial evidence. No ancient source explicitly says, "This is what we did." But this is the best reconstruction from the scattered evidence that we do have. Here's how it went:
- Many eastern Christians put Artemisios 14 in place of Nisan 14.
- Artemisios 14 is April 6 in the Julian calendar.
- Observance on Artemisios 14 / April 6 is well attested in regions like Syria and Egypt.
- These regions were known to have populations of Quartodecimans, and it would logically be Quartodecimans who were most interested in Nisan 14 date conversions.
- Besides Quartodecimans, the only other group who might have observed April 6 were the Montanists, but they were relatively few in number, and most agree the Montanists inherited this practice from the Quartodecimans.
So, the Artemisios 14 / April 6 date most likely comes from the Quartodecimans.
Now, let's get some source material in here to back this up.
Talley, who got this ball rolling for me in the first place, agrees:
"In both Asia and Cappadocia the concern was not to observe a given Julian date, April 6 or March 25, but to observe the fourteenth day of the first month of spring..."
-Thomas Talley, "Further Light on the Quartodeciman Pascha and the Date of the Annunciation", p. 4
"Although for him [Sozomen] that paschal date of April 6, the old Asian 14 Artemisios, was peculiar to a Montanist group, there is every reason to believe that the early Quartodeciman Christians in Asia had observed the same date..."
-Thomas Talley, "Origins of the Liturgical Year", pp.8-9.
Every reason to believe Quartodecimans were observing Artemisios 14 / April 6? Interesting! Talley is so convinced of this, he calls April 6 "that Quartodeciman date" ("Origins" p. 97).
Talley refers us to Epiphanius. In his book "Panarion", Epiphanius says this about the Quartodeciman beliefs:
"And there is no little dissension in their [the Quartodecimans] ranks, since some say the fourteenth day of the month [this is the eastern date], but some, the eighth before the Kalends of April [this is the western calculation]."
-Epiphanius of Salamis "Panarion" Quartodecimans 50.7 (374-378 AD).
Epiphanius is writing about the Quartodecimans here, specifically. This makes it abundantly clear at least some Quartodecimans did observe April 6. But not all Quartodecimans. Some had adopted Hippolytus' date of March 25.
We can list several other names that support these conclusions: Louis Duchesne (Conferences), Hans Lietzmann (A History of the Early Church), Paul F. Bradshaw and Maxwell E. Johnson (The Origins of Feasts, Fasts, and Seasons in Early Christianity), Andrew McGowan (Ancient Christian Worship), Susan K. Roll (The Feast of the Nativity), Hans Förster (The Celebration of Christ’s Birth in the Early Church), Paul Barnett Simmons (The Origins of Christmas and the Date of Christ's Birth), and of course, reputable online resources like Biblical Archaeology Review.
Here is your simple, condensed takeaway:
Many Quartodecimans were almost certainly observing Artemisios 14 / April 6. But why is that important? Because in the same way March 25 becomes December 25 when integral ages are applied, April 6 becomes January 6 - the date of Epiphany. This means the Quartodecimans are the primary suspects for why we have Epiphany on January 6.
This is clearly Talley's position.
"The same relationship is visible between April 6 and January 6 without any reference (pace Norden!) to the quarter days [solstices and equinoxes]. Rather, these winter dates can both be seen as the result of the same paschal calculation, with the conception/annunciation on March 25 leading to the nativity on December 25 in the West, and the conception/passion on April 6 leading to the nativity on January 6 in the East. [...] The persistence of the April 6 date in the East for the passion, long after the Quartodeciman controversy had been resolved in favor of the Sunday observance, suggests that it was the paschal full moon date of the Asian calendar that underlay the January 6 nativity observance."
-Thomas Talley, "Origins of the Liturgical Year", pp.129. [bold mine]
"As the association of April 6 with the conception would lead to the dating of the nativity on January 6, so such an association of the conception with March 25 would lead to dating the nativity to December 25."
-Thomas Talley, ("Further Light on the Quartodeciman Pascha and the Date of the Annunciation", p. 4. [bold mine]
Other scholars, such as Paul F. Bradshaw and Maxwell E. Johnson (The Origins of Feasts, Fasts, and Seasons in Early Christianity), agree with Talley that Quartodecimans honored the nativity and did so on Epiphany.
So, although nothing explicitly says this, it very much looks like the Quartodecimans not only observed the nativity of our Lord on Epiphany, but they are the reason why we have Epiphany in the first place. Remember from the Toolbox section: Epiphany started in the eastern church as a memorial of our Lord's incarnation and birth. It started in Quartodeciman strongholds, and it persisted there. They were observing "Christmas" so to speak ...but on Epiphany.
The pagan co-opt theory (also called the History of Religions Theory or HRT) cannot explain both Christmas and Epiphany. Nor can it respond to the abundance of records from the early 200s which plainly show Christians in various places working out these dates. These calculations happened decades before there was any Roman celebration on December 25, and there was no corresponding pagan festival for Epiphany to co-opt. Compare that to the grand total of zero ancient records positively demonstrating a pagan co-opt.
HRT cannot overcome these points. The claim that Christmas and Epiphany are pagan is built on sand.
ROBOT ROCK
Given what I wrote about in my article "Writing in the AI Age", I decided to run my conclusions past multiple AI platforms. After those AI platforms gave me rave reviews for accuracy and unassailability (some, of course, telling me I could neutral it up a bit), I decided to ask follow-up questions to only two platforms. I asked ChatGPT and Grok what I thought were simple questions:
How can I know when those old sources say something like "14th of the month" (or similar) that they were referring to Nisan 14 and not Artemisios 14?
Did the conversion of Nisan 14 to Artemisios 14 happen early enough that it could have led to or influenced the choice of Epiphany on January 6?
I was wholly unprepared for the AI vs AI battle that I would spark. I liken it to a dispute on the scale of the Quartodeciman controversy.
ChatGPT went on a wild tangent, completely reversing everything it had just minutes earlier assured me was accurate and unassailable. It reassured me I was still correct, but I was also wrong and would have to rewrite everything. That startled me. How could I be wrong with so much scholarly support? So, I took its concerns to Grok. Grok disagreed. Strongly. Grok insisted my article was perfectly defensible and aligned with the majority scholarly opinion.
I found myself copy/pasting responses between the two platforms for several minutes (yes, the AIs argued with each other). One would say the other was wrong, and back and forth we went. Until ... after several rounds of back-and-forth, ChatGPT, the cautious one, finally conceded Grok's point that the consensus of modern liturgical historians is exactly what I had written in the first place. Thus, ChatGPT timidly reversed itself a second time, and Grok had a hardy crow for its victory.
Turns out even the robots need to read Talley, Bradshaw, and Roll before they render a verdict.
[This is not an endorsement of any AI system. They each have strengths and weaknesses. If you use AI, make sure you a) understand how it works, and b) force it to triple-check everything it tells you.]
TENTATIVE DECISIONS
Why do I care about these Quartodecimans and their ties to Epiphany so much in the first place? Please allow me to explain, briefly.
Readers here already know this but others may be unfamiliar - As Bereans Did is a polemics blog dedicated to the investigation of what we call Armstrongism, after its founder Herbert Armstrong. Armstrongism - a branch of Seventh Day Adventism - has long claimed to be modern theological descendants of the Quartodecimans.
"Among the Gentiles the churches in Asia remained the most faithful to the word of God. We pick up the story of the true Church in the lives of such men as Polycarp and - Polycrates. They were called 'Quartodecimani' because they kept the true Passover celebration instead of Easter."
-Herbert Armstrong, "True History of the True Church", 1959, p.15
That's only partly correct, because they did observe Easter Sunday. (See our Quartodeciman posts for more.)
The claim is still alive and well. The United Church of God repeated it recently in their article "Church Driven Underground" from July 27, 2025. Author Tom Robinson said:
"Faithful Christians in the first few centuries after Christ were sometimes called Quartodecimans, from the Latin for 'fourteen,' as they continued to observe Passover on the 14th of the Hebrew month of Nisan..."
"Faithful Christians" is code for "one true church" which is code for Armstrongism. Armstrongism is not descended from the Quartodecimans, of course, neither directly nor indirectly. But this claim by Herbert Armstrong, the "founder, Pastor General, and spiritual and temporal leader of the church since its inception", forces the system to own the Quartodecimans ...and everything we learn about them, which now includes both Easter and the Nativity (Epiphany at first, then later Christmas).
If we only listen to Armstrongists, we would believe the Quartodecimans were opposed to honoring the resurrection on Sunday (Easter). But upon further inspection, it turns out they were not. They did observe the resurrection on Sunday, they just put an emphasis on a Nisan 14 date for the Last Supper.
And if we only listen to Armstrongists, we would believe Epiphany was pagan and the nativity resolutely to be ignored. In my post "Nimrod's Birthday Was January 6?", we explored how Herman Hoeh "the most accurately-informed historian in the world" tied both Christmas and Epiphany to Nimrod. That is patently false, of course. Absurdly false. But it was the official line from the church for decades! No going back now. Today, we have seen the Quartodecimans were not in any way opposed to observing the Nativity of Christ, and they did it on Epiphany.
Out of one side of the mouth, Armstrongism calls the Quartodecimans "the true church", but out of the other, they call anyone who observes Easter and Christmas/Epiphany "Nimrod-worshipping pagans". Now we see that must include the Quartodecimans.
So, Armstrongists now have a decision to make:
A) Own that the very "true church" itself observed Easter and the Nativity, and admit Herbert Armstrong et al were wrong.
-Or-
B) Stop claiming Armstrongism is theologically descended from the Quartodecimans, and admit Herbert Armstrong et al were wrong.
Take your pick.
CONCLUSION
What did we see today?
1) Quartodecimans likely started Epiphany.
2) HRT cannot withstand this.
3) Any church who claims the Quartodecimans as their ancestors must deal with this.
Let’s put it all together one last time.
Early Christians determined the dates of Jesus' crucifixion - March 25 in the west and April 6 in the east. Then, they used the principle of integral ages and careful reasoning - not pagan festivals - to arrive at the dates for Jesus’ birth - December 25 Christmas in the west and January 6 Epiphany in the east.
The people who first championed the western date of March 25 were Tertullian and Hippolytus. The primary suspects for who first championed the eastern date of April 6 are the Quartodecimans - the same people Herbert Armstrong and his successors have long hailed as the one faithful “true church” that kept the pure apostolic faith. Pascha on the 14th wasn't the only thing the Quartodecimans did. They had an entire life beyond that day, which included honoring Easter Sunday and celebrating the Nativity of Christ on Epiphany. They are, it seems likely, the reason Epiphany exists at all.
After Nicaea, the Quartodecimans gradually blended into the greater church and began keeping both Epiphany and Christmas. But Epiphany is with us to this day.
Armstrongism can’t have it both ways.
You can either keep claiming the Quartodecimans as spiritual ancestors, but then you must also own Easter and Epiphany - or - you can keep calling Christmas and Epiphany pagan, but then you must admit the Quartodecimans were pagan as well, and out goes "true history of the true church".
Either way, Herbert Armstrong et al were wrong.
Paganism or one true church - which? One of those two pillars must fall. I’ll let you decide.
As for the rest of us who believe - whether you observe December 25, January 6, both, or neither - may we all rejoice that the Word became flesh and dwelt among us. Christmas and Epiphany are not birthdays; they honor ideas - BIG, theological ideas - of the incarnation and the birth of God. The early church, Quartodecimans very much included, did not forget this astonishing truth.
It’s a good day to remember it again.
Merry Christmas! Happy Epiphany! And grace and peace to you in the Name that is above every name, Who became flesh like we are so He could die to save us all. This is the true meaning of Christmas and Epiphany.
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It is important that you understand; Everything on this blog is based on the current understanding of each author. Never take anyone's word for it, always prove it for yourself, it is your responsibility. You cannot ride someone else's coattail into the Kingdom. ; )
Acts 17:11
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