Probus Antoninianus RIC V Probus 657

Monetary Context and Reform Standards

The antoninianus designated as RIC V Probus 657 belongs to the late third-century monetary landscape reshaped by the reforms of Aurelian in AD 274. Following decades of relentless debasement that reduced the double denarius to a negligible fraction of silver, Aurelian stabilized the denomination at a theoretical ratio of twenty parts base metal to one part fine silver, or approximately five percent precious metal content. Probus sustained this standard throughout his reign from AD 276 to AD 282, issuing millions of radiates across the empire to meet administrative and military expenditures. Although officially tariffed as a silver denomination, these coins were struck on copper-alloy blanks and subjected to pickling or blanching processes in acidic baths to enrich the surface silver before striking. This gave newly minted specimens a bright white appearance that wore away rapidly in everyday commerce. As a product of Siscia, RIC V Probus 657 mirrors the established weight standards of late third-century Balkan coinage, typically clustering between 3.5 and 4.2 grams, though individual surviving specimens exhibit the standard wide dispersion inherent to mass production in ancient mints.

Production and the Siscia Mint

Production of RIC V Probus 657 was centered entirely at the imperial mint of Siscia, modern Sisak in Croatia. Situated strategically near the confluence of the Sava and Kupa rivers, Siscia was established under Gallienus to supply the central Danubian legions and rapidly grew into one of the most prolific mint operations in the Roman world. Under Probus, the mint operated multiple workshops, designated by Latin letters or Greek numerals in the exergue, often combined with the value mark XXI. Siscia was renowned for exceptionally high technical and stylistic standards; its die-cutters executed sharp portrait details, disciplined lettering, and intricate armor decorations that distinguish its products from Western mints such as Lugdunum or Eastern facilities such as Cyzicus and Antioch. The striking of RIC V Probus 657 formed part of large-scale military funding operations supporting Probus's campaigns against Germanic invaders along the Rhine and Danube, as well as preparations for eastern expeditions.

Obverse Iconography and Bust Variants

The obverse of RIC V Probus 657 features the portrait of Probus surrounded by the radiate crown, the long-standing diagnostic attribute of the antoninianus indicating a double denomination. Siscia was notable for striking an extraordinary range of bust varieties for this single catalogue type. Documented configurations include conventional right-facing busts with drapery, cuirass, or a combination of both. In addition, the issue embraces more aggressive martial portraits, such as the emperor holding a spear across his shoulder or facing left in a cuirass. Among the most distinctive and celebrated variants is the left-facing bust in which the emperor is helmeted, radiate, and seen from behind, grasping a spear in his right hand and bearing a decorative shield upon his left arm. This defensive posture emphasized the emperor's active martial leadership, presenting him as both warrior and guardian of the frontier provinces.

Reverse Iconography of Concord

The reverse of the type depicts the emperor standing to the right, clad in military dress, extending his right hand to clasp that of Concordia, who stands facing him on the left. Concordia, the personification of harmony and unity, is typically garbed in a stola and often holds a sceptre or cornucopia, though her primary visual action is the dextrarum iunctio, the ceremonial clasping of right hands. This intimate gesture, deeply rooted in Roman political and matrimonial iconography, symbolized fidelity, agreement, and mutual trust. In this specific composition, the physical clasp between the emperor and Concordia translates an abstract political concept into an explicit compact: the ruler and the concord of his soldiers are bound together in unbroken cooperation. The design served as a public affirmation that the Danubian legions stood in harmonious alignment with their commander.

Epigraphy and Legend Structure

The obverse legend of RIC V Probus 657 reads IMP PROBVS INV AVG, expanding to Imperator Probus Invictus Augustus. The insertion of the honorific INV, representing Invictus or Unconquered, is an important epigraphic hallmark of Probus's Danubian coinages. Rooted in the cult of Sol Invictus and popularized during the military crises of the third century, the title asserted that the emperor was perpetually victorious against barbarian incursions and internal rebellion. The reverse carries the legend CONCORD MILIT, an abbreviation of Concordia Militum, meaning 'Concord of the Soldiers.' By condensing the phrase into two brisk words, the mint die-cutters preserved maximum clarity and legibility while leaving ample field space for the standing figures. Below the exergual line, workshop and value signatures typical of Siscia, such as XXI followed by officina letters, verified the bullion standard and internal administrative accountability.

Typology and Chronological Classification

Catalogued by Percy H. Webb in Roman Imperial Coinage Volume V, Part 1, type 657 encapsulates a coherent conceptual issue defined by the pairing of the IMP PROBVS INV AVG obverse legend with the CONCORD MILIT hand-clasping reverse type at Siscia. Karl Pink, in his foundational study of the coinages of Probus, situated this issue within the complex sequence of Siscia's emissions between AD 276 and AD 282. While early emissions at Siscia favored longer titular formulas, shorter and more direct forms including the Invictus epithet became prominent during intermediate and later campaign phases. The multiple bust styles assigned to RIC V Probus 657 were not minted simultaneously at random; rather, they reflect workshop assignments and stylistic evolutions across successive production runs. Modern numismatists recognize that RIC combines several discrete officina marks and bust treatments under this single overarching type number.

Circulation and Hoard Evidence

Radiates of RIC V Probus 657 circulated widely throughout the military zones of the Rhine and Danube frontiers, as well as in central Mediterranean commerce. The denomination formed the everyday transactional backbone of the late third-century Roman economy. Massive hoards discovered across Europe, including the celebrated Venèra hoard in northern Italy and numerous finds across the Balkans and Gaul, confirm that Siscia's output travelled far beyond its provincial origin. Soldiers received payments in freshly struck billon radiates, which then diffused through civilian markets and regional garrison networks. Because billon radiates suffered no sudden official demonetization prior to the monetary reform of Diocletian in AD 294, coins of this type remained in active circulation for more than a decade after the death of Probus, accumulating significant wear that often stripped away their thin original surface silvering.

References

1. Coinage in the Roman Economy, 300 B.C. to A.D. 700. pp. 140-153
2. Roman Coins from the Earliest Times to the Fall of the Western Empire. pp. 130-136
3. Online Coins of the Roman Empire: RIC V Probus 657. ric.5.pro.657
4. Die Aufbau der römischen Münzprägung in der Kaiserzeit VI/1: Probus. Numismatische Zeitschrift 73, pp. 8-74
5. The Roman Imperial Coinage, Volume V, Part 1. pp. 87-88