Sol Invictus

Coin of Emperor Probus, circa 280, with Sol Invictus riding a quadriga, with legend SOLI INVICTO, "to the undefeated Sun". Note how the Emperor (on the left) wears a radiated solar crown, worn also by the god (to the right).

Sol Invictus ("the undefeated Sun") or, more fully, Deus Sol Invictus ("the undefeated sun god") was a religious title applied to at least three distinct divinities during the later Roman Empire; El Gabal, Mithras, and Sol.

Unlike the earlier, agrarian cult of Sol Indiges ("the native sun" or "the invoked sun" - the etymology and meaning of the word "indiges" is disputed), the title Deus Sol Invictus was formed by analogy with the imperial titulature pius felix invictus ("dutiful, fortunate, unconquered").

A festival of the birth of the Unconquered Sun (or Dies Natalis Solis Invicti) was celebrated when the duration of daylight first begins to increase after the winter solstice,—the "rebirth" of the sun.

Elagabalus of Sol Invictus

The title first gained prominence under the emperor Elagabalus, who abortively attempted to impose the worship of El Gabal, the sun-god of his native city Emesa in Syria. With the emperor's death in 222, however, this religion ceased, though emperors continued to be portrayed on coinage with the radiant sun-crown, for close to a century.

In the second instance, the title invictus was applied to Mithras in private inscriptions by devotees. It also appears applied to Mars.

Aurelian of Sol Invictus

Aurelian in his radiated solar crown, on a silvered bronze coin struck at Rome, 274-275

The Roman gens Aurelia was associated with the cult of Sol. After his victories in the East, the emperor Aurelian introduced an official cult of Sol Invictus, making the sun-god the premier divinity of the empire, and wearing his radiated crown himself. He founded a college of pontifices, and dedicated a temple to Sol Invictus in 274. It is possible that he created the festival called dies natalis Solis Invicti, "birthday of the undefeated Sun", which is recorded in 354 as celebrated on the 25th December; but no earlier reference to it exists.

Constantine of Sol Invictus

Coin of Emperor Constantine I depicting Sol Invictus with the legend SOLI INVICTO COMITI, circa 315.

Emperors up to Constantine portrayed Sol Invictus on their official coinage, with the legend SOLI INVICTO COMITI, thus claiming the Unconquered Sun as a companion to the Emperor. During the reign of Constantine the coinage ceases to be pagan in 325, and Sol Invictus disappears with the rest at that date.

Constantine decreed (March 7, 321) dies Solis

On the venerable day of the Sun let the magistrates and people residing in cities rest, and let all workshops be closed. In the country however persons engaged in agriculture may freely and lawfully continue their pursuits because it often happens that another day is not suitable for grain-sowing or vine planting; lest by neglecting the proper moment for such operations the bounty of heaven should be lost..

The religion of Sol Invictus continued to be part of the state religion until paganism was abolished by the decree of Theodosius I decree on February 27, 390.

Alleged representation of Christ as the sun-god Helios/Sol Invictus riding in his chariot. Third century mosaic of the Vatican grottoes under St. Peter's Basilica, on the ceiling of the tomb of the Julii.

Christianity adopted some of the attributes of the Sol Invictus religion, as apparent in the first examples of Christian iconography, depicting Jesus Christ with solar attributes such as the radiated crown or, in a few instances, a solar chariot..

Sol Invictus had been adopted by the Church of Rome, as evidenced by Christ depicted as Apollo-Helios in a mausoleum discovered under St. Peter's Basilica and dated to 250^[1], and, from the beginning of the third century, "Sun of Justice" was used as a title of Christ^[2].