, Germany
Sol Invictus (English translated as "Unconquered Sun") was long thought to have been a foreign
state-supported sun god introduced from either
Emesa or
Palmyra in Syria by the emperor
Aurelian in 274 and overshadowing other Eastern cults in importance, until the abolition of
classical Roman religion under
Theodosius I. However the evidence for this is meager at best, and the notion that Aurelian introduced a new cult of the sun ignores the abundant evidence on coins, in images, in inscriptions, and in other sources for a strong presence of the sun god in Rome throughout the imperial period.
Tertullian (died 220 CE) writes that the
Circus Maximus was dedicated primarily to Sol. During the reign of Aurelian, a new
College of Pontiffs for Sol was established. There is some debate over the significance of the date 21 December for the cult of Sol. According to a single, late source, the Romans held a festival on 21 December of
Dies Natalis Invicti, "the birthday of the unconquered one." Most scholars assume Sol Invictus was meant, although our source for this festival does not state so explicitly. 25 December was commonly indicated as the date of the
winter solstice, with the first detectable lengthening of daylight hours. The
Philocalian calendar of AD 354, part VI, gives a festival of on 25 December. There is limited evidence that this festival was celebrated before the mid-4th century. The same
Philocalian calendar, part VIII, also mentions the
birth of Jesus Christ, stating that the "Lord Jesus Christ was born eight days before the
calends of January" (that is, on 25 December). Since the 12th century, there have been speculations that the near-solstice date of 25 December for
Christmas was selected because it was the date of the
festival of , but historians of late antiquity make no mention of this, and others speculate
Aurelian chose 25 December to shadow early Christian celebrations already on the rise. When the festival on 25 December was instituted is not clear, which makes it hard to assess what impact (if any) it had on the establishment of
Christmas. There were also festivals on other days in December, including the 11th (mentioned above), as well as August. Gordon points out that none of these other festivals are linked to astronomical events. == Connection to emperors ==