These are the difficulties which stand in the way of accepting the 25th December as the actual date of the Nativity, and they must be taken into account by any one who desires to form a judgment for himself on this matter. The other questions relating to the same point are more easily disposed of.
Whether the accepted date is correct or not, we find it definitely set down by the chronographer of 354, who directly states that Christ was born on the 25th December (natus est octavo Kalendas Januarias), while it follows indirectly from his words that this day was solemnly observed as the day of His nativity. The Calendar ends with the year 354, and accordingly Christmas was observed then in the same way as at present. The year 354 brings us within the pontificate of Liberius, and it is just in his pontificate that we find further authentic evidence concerning the feast.
During his pontificate Liberius gave the veil to Marcellina, an elder sister of St Ambrose. This took place on the day of our Lord’s birth (Natalis Salvatoris), and on this occasion Liberius delivered a sermon preserved for us by Ambrose in his De Virginitate. In this work he recalls to his sister’s memory what the Pope had said: “When thou sealedst thy vow of virginity in St Peter’s by changing thy habit on the birth-day of the Redeemer—on what more fitting day could it have taken place than that on which the Virgin (Mary) brought forth her child—and in the presence of many of God’s hand-maidens who strove for thy companionship, he (Liberius) said, ‘Thou hast desired excellent espousals, my daughter. Thou seest what a crowd of people have come together to celebrate the birth-day of thy Bridegroom, and that no one goes away from hence unnourished. He it is who, when invited to the marriage, changed water into wine. He will vouchsafe the true secrets of virginity to thee, who until now hast been subject to the beggarly elements of nature. He it is who, with five loaves and two fishes, satisfied four thousand men in the wilderness.[324] He could have satisfied more had more been there. Finally, He has invited still more to thine espousals, not to give them barley-bread, but a Body from heaven.’”[325]
Liberius here represents taking the vows of religion under the familiar figure of a marriage. The marriage feast always forms part of every marriage, and accordingly it was the duty of the Bridegroom whom Marcellina had chosen to provide one. He had changed water into wine and fed thousands with a few loaves, but now He feeds a still greater number with His mystical Body in the Holy Eucharist. This is the thought running through the Pope’s address.
St Ambrose does not inform us of the year in which the ceremony took place at which Liberius spoke the above words. Liberius had been elected bishop of Rome (17th May 352) in troublous times under the Emperor Constantius, a strong Arian. As he refused to communicate with the Eusebius and protected St Athanasius, he was banished to Berœa at the end of 355, where he was compelled to remain until 357. The Archdeacon Felix, relying on the Emperor’s support, allowed himself to be consecrated bishop in his stead, but found no following in Rome. On this account, Constantius consented to the recall of the lawful bishop, and Liberius resided in Rome for the remainder of his pontificate, and died there in 366.
It is more probable that Marcellina’s clothing with the religious habit took place during the latter part of this pontificate. For according to the received opinion, St Ambrose was born about the year 340,[326] and thus in 353 he would have been only thirteen years old, and although his sister was older, yet in 353 she would not have been twenty-five, the canonical age for taking the veil.[327] Still it is not impossible that the ceremony and the address of Liberius took place between 352 and 354, and at any rate this much is certain that it took place on the 25th December and not on the Epiphany (6th January), according to the view formerly held.[328] There is no evidence that the Epiphany was observed in Rome, as it had been in the East, as the day of Christ’s birth, and Liberius in this address does not say that the commemoration of the miracles of the loaves and of the changing water into wine was being celebrated precisely on the day of Marcellina’s taking the veil, i.e. on the day of the Saviour’s birth (Natalis Salvatoris). These things were alluded to only because of their connection with the train of thought followed by Liberius in his address.
Nothing can be gathered from the words of Liberius as to when Christmas was first observed in Rome on the 25th December. In any case, it did not come into existence suddenly, but would require time, and, like other festivals, a considerable period would have to elapse before it became general and gained official recognition. Contemporary evidence on this point is wanting; one ancient witness, unfortunately not altogether reliable, speaks of Julius I. and not Liberius as the originator of Christmas.
We must now conclude by giving the view we have arrived at. In Rome a distinctive custom had arisen of celebrating Christ’s nativity on the 25th December, while in other quarters it was celebrated on the 6th January. How this was brought about must remain a matter for conjecture. It has been thought that in some places heathen festivals of various kinds were kept in the month of December; in particular, the Kikellia[329] was kept at Alexandria on the 25th December, in Bostra and Pella, a festival of local observance,[330] and in Rome, the Saturnalia began on the 17th December and lasted until the 23rd.[331] It is only natural that the winter solstice should give rise to a festival, and find its place marked in the Calendar of Feasts. Indeed, in the Roman Calendar of much later date—that of Philocalus—the 25th December is marked as the birth-day of the unconquerable Sun-God (Natalis Solis Invicti).
Since on the 21st December the sun reaches its lowest point, and then begins once more to rise higher in the heavens, man, in his simplicity, marked the day on which this change in the sun became perceptible as the new birth or birth-day of the sun, the invincible Sun-God. What was more natural for the Christians of that age than to connect this obvious natural event with the thought of the nativity of Him who is the Light of the World! Even if the Holy Scriptures had not suggested this idea, it must have presented itself to the Christian mind. The comparison of Christ with the sun, and of His work with the victory of light over darkness, frequently appears in the writings of the Fathers. St Cyprian[332] spoke of Christ as the true sun (sol verus). St Ambrose[333] says precisely, “He is our new sun” (Hic sol novus noster). Similar figures are employed by Gregory of Nazianzus, Zeno of Verona, Leo the Great, Gregory the Great, etc.[334]