Why Christmas Day is Christmas Day

The seasons, festivals, historians and emperors have all influenced the date of Christmas.

Ryan Gilfeather

Ryan Gilfeather explores social issues through the lens of philosophy, theology, and history. He is a Research Associate at the Joseph Centre for Dignified Work.

a had holds out a small wrapped Christmas present.

I came of age in the 2000s, a decade quite alien to us now. We saw ourselves as pioneers of technology, as the internet emerged in its prehistoric form. There was great optimism about the economy until it all went wrong in 2008. The New Atheism movement was roaring into public view, only to wane just as quickly the decade after. Growing up as a Christian, I remember spirited debates with my peers about whether science disproved Christianity and if God can be disproven. These questions have fallen out of view, just as many of its main proponents have too. Richard Dawkins rarely darkens the door of our TV screens anymore.

However, one such moment of conflict sticks out in my mind. A friend announced to me that he had disproved the origins of Christianity. The night before he had discovered that in the third century Roman Empire, before Christianity became legal and the official religion, there was already a festival celebrating a god on the 25th of December. Instead of the birth of the Son of God, the Romans celebrated the rebirth of the Unconquered Sun — Sol Invictus. Then, in 336 under the first Christian Emperor, Constantine, that date was first celebrated as the day of the birth of Christ. My friend considered the case to be closed; surely the birth of Christ was merely a repurposing of an existing festival?

Thankfully this shocking revelation did not pick away at the foundations of my faith. I continued, and still continue, to believe in and love the Christian God, as revealed in the Bible. Indeed, since that moment I have trained as a scholar in the history of the early Church, and have begun to see this question for what it is, a quirk of history.

We, therefore, celebrate Christ’s birth on the 25th December on account of a quirk of history, a result of the way that Romans mapped significant events on to the waxing and waning of the light.

The first claim that Christ was born on the 25th December appears in the third century. Sextus Julius Africanus, a Roman Christian historian, wrote an entire chronology of the world from creation to AD 221. He considered March 25th to be the date of creation, because it was the spring equinox in the Roman Calendar, a day which represents new life and new birth. For this reason, he likewise considered it to be the date of Christ’s conception in the womb. Crucially, nine months after that falls December 25th. Although I admire his logic, it is hardly a sound basis for establishing the date of our Lord’s birth. Indeed, other Christians didn’t accept this claim at the time either.

As already mentioned, December 25th was a significant date in the Roman calendar already. It was the winter solstice, the shortest day of the year, after which the days begin to lengthen. It also shortly followed the popular Roman festival of the Saturnalia. Already endowed with significance, it is unsurprising that the Romans began to celebrate the rebirth of Sol Invictus, and the birth of another god, Mithras, on that date.

At this time Christianity was an illegal religion, persecuted in some parts of the Roman Empire. However, in 312, the emperor Constantine converts to Christianity and in 313 makes it a legally tolerated religion. At this point he begins to invest the church and Christians with powers, wealth and privileges. Evidence from the Chronography of AD 354 suggests that Christmas was first celebrated on the 25th December in 336, during the reign of Constantine. Perhaps this was an attempt to dislodge existing pagan holidays, and replace it with a Christian one. Or, maybe the significance of the Winter solstice made that date most plausible. Indeed, it is easy to see how the commemoration of Christ coming into the world is particularly salient as the darkness begins to recede. The true answer is, of course, lost to history.

We, therefore, celebrate Christ’s birth on the 25th December on account of a quirk of history, a result of the way that Romans mapped significant events on to the waxing and waning of the light. The true lesson here though, is that it simply doesn’t matter what the actual date of Christ’s birth was. Our records, and those available in the early church were simply not good enough for us to ever know. What matters is that God loves us so much, that he became human to bring us back to his side in everlasting joy and peace. We have no idea on what date Christ was born. But, each year the 25th December presents a time for us to remember that God became man, so that we might have everlasting life.

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10 March 2025

2 min read

Giles Coren dips his toe in the water - will he take the plunge?

In a disembodied digital age, he's made a decision to participate instead.

Jamie Mulvaney

Jamie is Vicar of St Michael's Chester Square, London.

A casually dressed man strides down the aisle of a church between the pews.

Danique Godwin on Unsplash

It takes a lot of courage to write about what you don’t know. Newspaper columnists and restaurant critics are paid to be omniscient, and Giles Coren is very good at channeling observation and insight into his articles in an acerbic and amusing way.

He recently wrote in The Times about what he does and doesn’t know about Christianity. He wrote with humility and humour, which amongst other things made me wonder how many of us who are part of the church would do well to be honest about what we don’t know.

The journey that Coren tells about his “not not believing” is staked along the way by the language of the church and its buildings. In other words: worship.

Belle Tindall recently wrote about the prejudice met by Kate in White Lotus when she tells her friends that she finds going to church “very moving.” To them it is “self-defeating”, but perhaps it opens us up the possibility that there is a greater centre of gravity than our own selves. Going to church has been associated with so many unhelpful divisions and distractions and often the church is to blame.

But believers and non-believers alike run the risk of missing out on so much of faith. We limit it to information and observation, when the full benefit is found in participation. Whether pilgrims, prodigals or someone else altogether, we can analyse and stand on the sidelines as much as we want, but Coren and his son are taking part:

“I gave up not going to church some time ago. Most Sundays I am there, praying and singing — another lapsed atheist hoping that the non-existent God he was brought up not to believe in doesn’t see.”

Perhaps this act, and writing about it in The Times, is even braver given our seemingly disembodied, digital, post-pandemic individualistic lives. A podcast may give you propositional truths you can accept or reject, but being caught up in worship is in a different order altogether. Coren writes:

“And I have a sense that God is there — in the tradition, the words, the 2,000 years of conviction, the imagination of all the people who came before me…”

God is the interesting thing about Christianity, and Christians believe that this God became human. Amidst all that we don’t know and don’t see, going to church makes tangible what can feel intangible.

Coren writes that the only moment he feels left out is in Communion, and that perhaps one day he will get baptised. The Greek word where we get ‘baptism’ from means to overwhelm. In an overwhelming world, more and more people are seeing the merit in being overwhelmed with God. If we are to experience this, it means that at some point we need to dive into the water.