Antoninianus — Probus — Sol Invicto

Obverse: IMP C M AVR PROBVS P F AVG, radiate bust of Probus in senatorial robes, holding eagle scepter

Reverse: SOL INVICTO, Sol driving a quadriga viewed from the front, right hand outstretched toward the sky, C M above, XXI S below

Mass: 2.7 g

Diameter: 23 mm

This antoninianus again shows Probus in senatorial robes rather than the more common military dress, holding an eagle-tipped scepter in the same civil, magistrate-like presentation used elsewhere in his coinage to soften his image as a soldier-emperor. The reverse depicts Sol Invictus driving a frontal quadriga, his right hand raised toward the sky, a dramatic and technically demanding type to engrave well given the difficulty of rendering a four-horse chariot head-on. The exergue mintmark XXIS, paired with C M in the field above, identifies the officina and mint responsible for striking this issue on the debased silver-to-bronze standard typical of the period. The piece shows attractive silvering on the reverse and mottled silvering on the obverse.

Sol Invictus, "the Unconquered Sun," rose to particular prominence in the third century as emperors increasingly promoted solar monotheism as a unifying religious and political symbol, a trend that would culminate under Aurelian's formal establishment of the cult a few years before Probus's reign. On coinage, Sol served as a potent visual metaphor for the emperor himself: a tireless, radiant, unconquerable force restoring light and order to an empire that had spent decades in political and military darkness.