a.d. VIII Kal. Ian.
December 25 in Ancient Rome
Dies Natalis Solis Invicti
festivalListed AD 354
Roman calendar date
The Calendar of 354 marks 25 December as the 'birthday of the Unconquered Sun'. Aurelian's temple of Sol dates to 274, but the 25 December festival is attested only in this calendar.
Background
The sun god Sol had long been worshipped in Rome, but in 274 the emperor Aurelian, after reuniting the empire, built a grand temple to Sol Invictus (the Unconquered Sun) and created a new college of priests and games for him every fourth year per the Chronography of 354 and later sources.
The calendar in the Chronography of 354 marks 25 December as N(atalis) INVICTI, "birthday of the Unconquered One", with thirty chariot races. The date was close to the traditional winter solstice, when the sun "is reborn" as days lengthen. The temple's dedication is dated to 274 by later chroniclers, but the festival on 25 December is attested only in the Calendar of 354, eighty years later; no ancient source says Aurelian himself chose that day disputed.
The same Chronography also contains the earliest known reference to Christ's birth celebrated on 25 December, in its list of martyrs (a record usually dated to 336). Scholars still debate whether the Christian date was chosen to rival the Sol festival or was calculated independently from the date assigned to the Annunciation disputed. For Roman city people, the day meant races in the Circus and a winter holiday.
⚠ Uncertain date: The cult's festival may date from Aurelian (274); the earliest calendar evidence is 354.
Ancient source: Chronography of 354, calendar (VIII Kal. Ian.: N. INVICTI CM XXX) · Reference
Sources
☁ Rome today (1991–2020 avg): 12°/5°C (54°/41°F) · rain 35% of days
Rome in DecemberDecember's highlight was the Saturnalia (from 17 December).
Fields & crops
Olive picking and pressing, wood-cutting, and indoor work on rainy days; sowing ideally finished by the Kalends per Columella 11.2.
Courts & law
Courts closed for the Saturnalia; quaestors gave gladiatorial shows in December in late antiquity per the Chronography of 354.
Senate & politics
New tribunes of the plebs entered office on 10 December; outgoing magistrates closed their accounts before the year ended Republic.
Military
Winter quarters. Soldiers too kept the Saturnalia, choosing a mock 'king' per the Acts of Dasius, a late and disputed martyr text.
Festivals & religion
Faunalia (5 Dec.), Agonalia and Septimontium (11 Dec.), Consualia (15 Dec.), Saturnalia (from 17 Dec.), Opalia (19 Dec.), Divalia (21 Dec.), Larentalia (23 Dec.), and later the birthday of Sol Invictus (25 Dec.).
Daily life
December's highlight was the Saturnalia (from 17 December). Business stopped, people wore the casual pilleus cap and gave small gifts, and households let enslaved people eat with, or even be served by, their owners per Macrobius 1.7, Seneca Ep. 47. Seneca, though, notes that the inversion lasted only days; the rest of the year enslaved people stood silent and hungry while masters dined, and could be beaten for a cough per Seneca, Ep. 47. Seneca himself grumbled that the whole city "sweats" with feasting Seneca, Ep. 18.
On farms, olives were picked and pressed, and enslaved workers repaired tools and baskets on rainy days per Columella 11.2.
Sources: Varro, De Lingua Latina 6 · Chronography of 354 · Seneca, Epistles 18 and 47 · Macrobius, Saturnalia 1.7–10
All days in December →
LATIN LINE OF THE DAY
Hoc est vivere bis, vita posse priore frui.
“To be able to enjoy one's past life is to live twice.”
Martial, Epigrams 10.23 · translation ours (literal)
