Probus Billon Antoninianus RIC V Probus 170

Monetary Context and Reform Standards

The emission catalogued as RIC V Probus 170 belongs to the reformed radiate series instituted by Emperor Aurelian in AD 274 and maintained throughout the reign of Probus from AD 276 to AD 282. During the middle of the third century AD, runaway debasement had reduced the radiate antoninianus to a meager silver content often falling below two percent. Aurelian enacted a structural monetary overhaul intended to stabilize the currency, producing an improved billon radiate tariffed at twenty parts bronze to one part silver (a ratio frequently signified by the mark XXI or KA on corresponding issues). Under Probus, this metallurgical benchmark was largely sustained, with coins typically weighing between 3.5 and 4.2 grams and containing roughly four to five percent silver. While nineteenth-century numismatic catalogues traditionally categorized these radiates under silver due to their official legal standing and nominal silver presence, modern metallurgical analyses categorize them strictly as silvered bronze or billon. The issue represented by RIC V Probus 170 formed the backbone of everyday commercial transactions and military payroll, maintaining the state's fiat value despite ongoing inflationary pressures across the empire.

Mint Organization and Production at Rome

RIC V Probus 170 was struck exclusively at the principal imperial mint of Rome. During the reign of Probus, the Rome mint was divided into multiple distinct operational workshops, termed officinae, which typically ranged from six to seven active ateliers designated by Greek or Latin numerals. The coin blanks were cast in molds and systematically prepared through an oxidation and acid-leaching blanching process that dissolved surface copper, leaving an artificially enriched, glistening microscopic skin of pure silver on the exterior of the planchet before striking. While some related reverse types of the Rome mint carry distinct officina letters or symbols in the field or exergue, RIC V Probus 170 represents the specific unadorned variety lacking field marks as catalogued by Percy H. Webb. Striking standards at Rome under Probus were noted for their careful execution, disciplined portraiture, and high relief relative to contemporary provincial and Balkan military mints such as Siscia, Serdica, or Cyzicus.

Obverse Portraiture and Style

The obverse of RIC V Probus 170 presents a right-facing bust of Probus wearing the radiate solar crown, an attribute that historically signified the double-denominational character of the antoninianus relative to the classical denarius. The emperor is depicted wearing military cuirass, emphasizing his identity as supreme commander of the Roman legions. The stylistic execution of the portrait reflects the official school of Rome, characterized by a realistic profile, a firm jawline, cropped military hair, and neatly delineated beard stubble. Unlike the ornate consular, heroic, or shield-bearing bust varieties frequently celebrated across Probus's broader coinage, this type utilizes the direct and austere cuirassed presentation. The die-engraving displays the balanced proportions typical of central Italian dies during the early to middle phases of the reign, avoiding the exaggerated or geometric abstractions seen at some eastern workshops.

Reverse Iconography of Fides

The reverse design depicts Fides, the Roman personification of fidelity and trustworthiness, draped in a classical stola and standing facing toward the left. In each hand, she firmly holds an upright military standard or ensign (signum), which is crowned with traditional decorative disks and terminal ornaments. This iconography, specifically framed by the accompanying legend, explicitly addresses military fidelity. In an era when imperial survival depended entirely upon retaining the favor and steadfast discipline of the legions, invocations of Fides were central to imperial propaganda. The twin standards represent the harmony of the armed forces standing under imperial command. The die-cutting renders the drapery folds of Fides with conventional classical restraint, contrasting her static, reliable posture with the active campaigning reality of Probus's mobile field armies.

Epigraphic Analysis and Titulature

The legends on RIC V Probus 170 are rendered in clear Roman capitals, following standardized epigraphic conventions of the late third century AD. The obverse legend reads PROBVS P F AVG, an abbreviated formulation expanding to Probus Pius Felix Augustus (Probus, Pious, Fortunate, Emperor). This concise titulature omits longer iterations of consular or tribunician numbers, presenting an accessible and unambiguous imperial proclamation. The reverse legend bears the uninterrupted inscription FIDES MILITVM (The Loyalty of the Soldiers). The epigraphy at the mint of Rome is notable for even letter spacing, regular serifs, and symmetrical placement along the inner perimeter of the beaded border, demonstrating the technical proficiency maintained by the urban moneyers.

Typology and Chronological Sequence

Within the typology of Probus's coinage established by Percy H. Webb in the Roman Imperial Coinage and refined by Karl Pink's structural studies, RIC V Probus 170 occupies a defined place in the early-to-mid emissions of the Rome mint. Assigned broadly to the years AD 276 to AD 282, the type corresponds to the routine mass emissions celebrating imperial legitimacy and military accord. In Pink's reconstruction of the Rome mint's sequences, types bearing the Fides Militum motif were produced in multiple successive emissions, appearing with and without exergual workshop signatures. RIC V Probus 170 specifically designates the variety where Fides stands left holding two standards without additional mintmarks or field letters recorded in the core catalogue entry, distinguishing it from adjacent variants bearing marks such as R followed by officina letters or XXI in the exergue.

Hoard Evidence and Circulation Patterns

Antoniniani of Probus from the mint of Rome circulated extensively throughout the western and central provinces of the Roman Empire. Specimens of RIC V Probus 170 and its related workshop variants appear frequently in substantial third-century coin hoards discovered in Italy, Gaul, Britain, and the Danubian basin, including major deposits such as the Cunetio and Normanby hoards. Because of their debased billon composition, these radiates circulated rapidly alongside issues of Aurelian, Tacitus, and Florian. In circulation, the thin superficial silver layer was routinely worn away, exposing the darker bronze core below. The type continued in active commercial circulation until the extensive monetary reform enacted by Diocletian in AD 294 progressively demonetized and recalled the pre-reform radiate coinage in favor of the new nummus and post-reform radiate fractions.

References

1. Monnaies de l'Empire romain XII.1: D'Aurélien à Florien (275-276 après J.-C.). General introduction to Third-Century billon radiate reform
2. Online Coins of the Roman Empire: RIC V Probus 170. ric.5.pro.170
3. Der Aufbau der römischen Münzprägung in der Kaiserzeit VI/1: Probus. Münzstätte Rom, Emissionen
4. The Roman Imperial Coinage, Vol. V, Part I. p. 192, no. 170