Hi Richard –
I have heard of no Christian document which states the date as December 25th...
Actually there is evidence, in the writings of Julius Africanus (160-240AD) and Hippolytus (170-235AD), although these come to us as subsequent copies. I'll cite the Hippolytus text:
For the first advent of our Lord in the flesh, when he was born in Bethlehem, eight days before the kalends of January (December 25th), the 4th day of the week (Wednesday), while Augustus was in his forty-second year, (2 or 3BC) but from Adam five thousand and five hundred years. He suffered in the thirty third year, 8 days before the kalends of April (March 25th), the Day of Preparation, the fifteenth year of Tiberius Caesar (29 or 30AD), while Rufus and Roubellion and Gaius Caesar, for the 4th time, and Gaius Cestius Saturninus were Consuls. (Commentary on Daniel, 4.23.3)
But before looking at this, some other points should be mentioned:
Clement of Alexandria (c150-215AD) mentions discussions about the date of Our Lord's birth, possibilities being March and April, but no mention of December! Origen, who succeeded Clement as head of the catechetical school in Alexandria, actually mocked the Roman practice of celebrating birthdays!
The common and popular assertion that December 25 was 'lifted' from a pagan holiday is just an assumption that's asserted by those who like to knock Christianity. There is just too much material evidence to show that the Christian communities of the first centuries were steadfast in their refusal to acknowledge any pagan festivals or practices. Not until the Church was much more secure in its foundation did this become the practice, and in the 7th we have Pope Gregory the Great writing in 601AD to the church in Britain, recommending that local pagan temples
not be destroyed but be
converted into churches, and that pagan festivals be celebrated as feasts of Christian martyrs.
This is theologically sound. Pagan festivals are essentially cosmically-founded, whereas Christianity saw itself as a metacosmic tradition – so the Church was simply pointing to the truths revealed beyond the veils of ignorance, and St Paul says much the same in his discourse to the Athenians from the Areopagus (Acts 17 and the reference to the statues of 'the unknown god'.)
We know that the Donatists in North Africa celebrated the Nativity on Dec 25 because they came into conflict with the Church over the celebration of the Epiphany! So we have evidence of Dec 25 being prior to 312AD.
On looking around, I've discovered some interesting facts about Sol Invictus:
No mention of Sol Invictus until Emperor Aurelian (270-275AD)
Aurelian re-introduced festival of Invictus by decree in 274AD – but not on Dec 25 – the traditional feast days of Sol (as recorded in the early imperial fasti) were August 8th and/or 9th, possibly August 28th, and December 11th.
Aurelian declared games to Sol every four years. The best evidence suggests the games were held October 19-22.
In a 4th Century manuscript called
The Chronography of 354, there is listed in December: N·INVICTI·CM·XXX. This is the first indication of a feast to the Invicti (the Unconquered) on Dec 25. No mention of SOL, but it is assumed.
But, the Chronography was a gift to a Christian aristocrat, and another section of the
Chronography commemorates the laying to rest of martyrs (
Disposition of Martyrs, the earliest record of the Roman sanctoral), the liturgical year begins on December 25, and VIII Kal. Jan. is annotated
natus Christus in Betleem Iudeae ("Christ was born in Bethlehem of Judea").
In a section listing the consuls, there also is a note for AD 1:
dominus Iesus Christus natus est VIII kal. Ian. These are the first references to December 25 as the birthday of Jesus. Since no martyrs are mentioned after AD 336, the first celebration of Christmas observed by the Roman church in the West is presumed to date to that year.
Even if INVICTI does refer to Sol Invictus on December 25th of this calendar, all this shows is that the celebration of Sol Invictus was placed on December 25th after Christianity had already widely accepted and celebrated December 25th as the Nativity of Christ.
There are many who will still assert that December 25th is Sol Invictus in ancient Rome. Some will even claim that another religion, Mithraism, has close connection to this December 25th celebration. In actual fact there is no ancient documentation tying Mithraism to December 25th or Sol Invictus. The Christian celebration of the Nativity of Christ as December 25th predates anything in the earliest actual documentation for Sol Invictus on December 25th.
In short, the evidence suggests that the Roman and Mithraic 'correspondences' with Christianity actually post-date the Christian by some margin, and are found only in Rome, the informed opinion being that both Rome and Mithraism appropriated Christian symbols, not the other way round!
+++
The most likely reason for December 25:
In Hebrew mystical speculation, the earth was made on March 25. Early Christian commemoration of the Passion falls about the same time. Prevalent in Hebrew mysticism is the idea of 'the cycle'. (The cycle is prevalent in nigh-on every tradition of mystical speculation, only modernity thinks in linear terms, something quite 'unnatural' and which has given rise to all manner of errors, the idea of 'spiritual evolution' being one, and the idea of 'progress' in terms of reincarnation being another).
Early Christian speculation on the birth of Christ was not to do with establishing 'Christmas Day' in the contemporary sense of the holiday, but was rather a reflection of a metaphysical world view. God made the world on March 25, and the Incarnation would happen on the same date, according to the law of cycles, established before the foundation of the world. Thus a conception date of March 25, and a nativity nine months later, on December 25. Our Lord would have been crucified on March 25, by the same reasoning.
Thus we have the idea of Dec 25 as the birth of Christ contemporary with Christian commentaries clearly showing that the actual date is unknown. It also appears that Dec 25 may well have emerged at various times and places, as the natural fruit of informed Hebrew mystical speculation, something later (Greek) commentaries were unaware of. It became established in Rome probably because it was quite common elsewhere, but only in that the date established the commencement of the Liturgical Cycle – a date subsequently revised, as the Roman Liturgical calendar now starts at Advent, although Advent also dates back to the very earliest days ...