Probus Antoninianus RIC V Probus 185

Monetary Context and the Post-Reform Antoninianus

During the reign of Probus from AD 276 to AD 282, the Roman imperial monetary system continued to operate under the institutional parameters established by Aurelian's currency reform of AD 274. The principal denomination produced for mass circulation was the radiate coin commonly termed the antoninianus or radiate fraction. While early modern numismatic catalogues frequently categorise these issues as silver due to their nominal heritage tracing back to the double denarius of Caracalla, the coins of Probus were struck in heavily debased billon. The alloy typically contained between four and five percent silver, enriched by an intentional surface-blanching treatment or silver wash that gave freshly struck specimens the temporary lustrous appearance of genuine precious metal. Under this system, the reformed radiate was marked by deliberate quality controls to standardise weight and tariffing. It functioned as an overvalued fiduciary currency designed to sustain extensive military payrolls and state expenditures without requiring unsustainable quantities of pure silver bullion. RIC V Probus 185 represents a characteristic urban emission within this managed monetary environment, combining regulated billon metallurgy with high-volume imperial mint output at the administrative core of the empire.

Production Standards and Rome Mint Operations

The production of RIC V Probus 185 was assigned exclusively to the imperial mint situated in the city of Rome. Operating multiple active workshops or officinae, the mint marked each emission with exergual control sequences indicating the specific workshop responsible for striking the flans. Officina letters recorded on coins of this series include Greek numerals such as Alpha, Gamma, Delta, Epsilon, and Zeta, as well as occasional Roman numeral counterparts or symbols indicating distinct production phases within Probus's six-year reign. Metrologically, billon antoniniani from this emission were struck to the post-reform target standard averaging around 3.8 to 4.2 grams, corresponding to an intended ratio of eighty-four coins per Roman pound. The flans were cast as circular blanks, heated, chemically depleted of surface copper to enhance silver content, and manually struck between engraved steel or bronze dies. The high quality of die engraving at Rome distinguished its output from provincial branch mints such as Lugdunum, Siscia, or Cyzicus, exhibiting refined portraiture, precise temple columnation, and neat epigraphic execution.

Obverse Iconography and Bust Variations

The obverse of RIC V Probus 185 is distinguished by two primary portrait presentations, both united by the canonical solar radiate crown that served as the mandatory visual marker of the double-denomination value. The first variety depicts Probus in right-facing profile, wearing detailed military cuirass adorned with layered pteryges at the shoulder. This combatant depiction emphasizes the emperor as the vigilant commander-in-chief and defender of the frontier provinces. The second major variety presents an elaborate left-facing bust showing the emperor wearing the ornate imperial mantle or trabea triumphalis and clasping an eagle-tipped sceptre, the scipio eburneus, in his right hand. This consular iconography celebrates Probus's assumption of civil magistracies, conveying majesty, senatorial partnership, and sacral authority. Die engravers at Rome rendered these bust variants with close attention to the emperor's mature facial features, short cropped military beard, and determined gaze, projecting energetic martial authority alongside ceremonial prestige.

Reverse Iconography: The Temple of Eternal Rome

The reverse design of RIC V Probus 185 features an elaborate architectural composition: a hexastyle temple within which the goddess Roma sits enthroned. Roma is depicted in full martial and civic majesty, facing frontally or turned slightly toward the left, holding a small statuette of winged Victory in her extended right hand and resting her left arm upon an upright vertical sceptre. The surrounding shrine is presented with six frontal columns supporting an unadorned or ornamented pediment, recalling the iconic double temple of Venus and Roma near the Roman Forum reconstructed following imperial fires. Architectural coin reverses enjoyed prolonged popularity during the Crisis of the Third Century as tangible symbols of ancestral permanence and continuity. By showing Roma offering Victory from her sanctuary, the die design explicitly rooted the current regime's military triumphs across Gaul, Raetia, and Illyricum in the timeless sanctity of the imperial capital.

Epigraphic Structure and Inscriptions

The epigraphy of RIC V Probus 185 is concise and focused, conforming to the standardised administrative formulas established by the central mint. The obverse legend reads IMP PROBVS AVG, expanding to Imperator Probus Augustus. This abbreviated formulation omits lengthy genealogical claims or territorial victory titles, relying solely on the paramount titles of supreme military commander (Imperator) and sacred sovereign (Augustus) to frame the central portrait. On the reverse, the legend ROMAE AETER provides the ideological motto, expanding as Romae Aeternae ('To Eternal Rome'). Rendered in the dative case of dedication, the inscription honours the deity and city while dedicating the regime's ongoing security to her unyielding endurance. In the lower exergual register beneath the temple podium, engravers placed mint and officina indicators, such as R followed by a workshop numeral or Greek letters identifying individual production lines, ensuring strict accounting control during mass coin manufacturing.

Typological Classification and Chronological Placement

Within Percy Webb's classification in Roman Imperial Coinage Volume V, Part 2, type 185 occupies a prominent place among the silver-washed billon issues produced at Rome. The type is differentiated from neighbouring entries primarily by its specific legend coupling IMP PROBVS AVG with ROMAE AETER and the hexastyle temple motif, contrasting with related issues that employ expanded obverse titles such as IMP C M AVR PROBVS P F AVG or alternate reverse designs depicting Roma in a tetrastyle shrine or seated on a curule chair. The emission was struck between AD 276 and AD 282, with chronological subdivisions determined by bust style and exergual sequences. Left-facing consular busts appear with increased frequency during and immediately following Probus's successive consulships in AD 277, 278, 279, 281, and 282, indicating that die cutters adjusted obverse presentations to mirror specific political milestones during the reign.

Circulation Patterns and Archaeological Evidence

Specimens of RIC V Probus 185 circulated extensively across the western and Danubian provinces of the Roman Empire, as evidenced by significant representation in contemporary coin hoards and urban excavations. Discoveries such as the Normanby Hoard in Britain and various third-century deposits throughout Gaul and northern Italy confirm that billon radiates struck at Rome travelled along major military routes to supply garrisons and provincial administrative nodes. Because the billon alloy retained only a thin wash of surface silver, genuine circulating specimens rapidly lost their bright white finish through transactional wear, revealing the darker underlying bronze core. The wide distribution of RIC V Probus 185 illustrates the uniform acceptance of Aurelianic reformed antoniniani across the empire, functioning alongside provincial mint issues until the profound monetary overhaul enacted by Diocletian in AD 294 phased out the radiate denomination in favour of the newly tariffed nummus.

References

1. The Normanby Hoard and other Roman coin hoards. pp. 45-62
2. Monnaies de l'Empire romain XII.1: D'Aurélien à Florien (270-276 après J.-C.). pp. 67-85
3. Coinage in the Roman Economy, 300 B.C. to A.D. 700. pp. 140-158
4. Roman Coins from the Earliest Times to the Fall of the Western Empire. pp. 159-166
5. Online Coins of the Roman Empire: RIC V Probus 185. ric.5.pro.185
6. The Roman Imperial Coinage, Volume V, Part II. p. 38