Postumus Billon Antoninianus RIC V Postumus 70

Monetary Context and the Gallic Currency System

The creation of the Gallic Empire in AD 260 was accompanied by an urgent overhaul of currency administration in the northwestern provinces of the Roman Empire. Following the capture of Emperor Valerian by Shapur I and the consequent dispersion of central authority, Marcus Cassianius Latinius Postumus claimed imperial power along the Rhine frontier. One of Postumus's most pressing necessities was securing the financial loyalty of the Rhine legions and financing border defense against Germanic incursions. The central Roman mint under Gallienus was actively collapsing into runaway hyper-debasement, with the central antoninianus rapidly deteriorating to mere silver-washed bronze. In sharp contrast, Postumus initiated his monetary policy with an intentional conservative reform, as detailed by numismatic scholars such as Georg Elmer and Percy H. Webb. Postumus restored the antoninianus, or radiate double denarius, to an alloy containing roughly fifteen to twenty percent silver in the opening years of his reign, yielding an issue that was visibly superior to contemporary central imperial coinages. This monetary stability allowed Postumus to project fiscal responsibility and political autonomy. The type designated as RIC V Postumus 70 belongs to this monetary framework, functioning as the backbone of daily military remuneration and regular regional commerce. By maintaining a reliable intrinsic standard, Postumus successfully prevented catastrophic inflation within Gaul, Britain, and parts of Spain for much of the decade. Nevertheless, prolonged warfare and resource constraints eventually forced gradual alloy reductions during the late 260s AD across all Gallic mint outputs.

Production Standards and Mint Attribution

In the foundational volume of The Roman Imperial Coinage compiled by Percy H. Webb, RIC V Postumus 70 is placed squarely at the workshop of Lugdunum, the ancient capital of the Three Gauls with an established mint history. Webb based his cataloguing on stylistic continuities and established numismatic conventions of the late nineteenth and early twentieth centuries, which credited Lugdunum with the overwhelming majority of early Gallic imperial issues. Subsequent mid-twentieth-century scholarship by Georg Elmer fundamentally challenged this traditional attribution. Elmer argued that the primary administrative and minting operations of Postumus's early reign operated from Colonia Claudia Ara Agrippinensium (modern Cologne) on the Rhine border, closer to the active theatre of military command. In modern corpora and British hoard analyses, including the comprehensive Cunetio study by Edward Besly and Roger Bland, this production center is frequently described as Mint I. Whether localized specifically at Lugdunum or Cologne, the technical execution of RIC V Postumus 70 reveals seasoned die-engravers working under systematic bureaucratic control. Flans for this issue were cast as blanks before striking, exhibiting the characteristic oval or irregular circular shapes of late third-century billon production. Average weights for Postumus's antoniniani typically cluster between 2.80 and 3.40 grams, though striking irregularities and declining metal ratios over time produced substantial deviations across surviving specimens.

Obverse Iconography and Imperial Image

The obverse design of RIC V Postumus 70 presents an authoritative portrait of Postumus oriented toward the right. To signal the double-denomination value of the antoninianus, the emperor is depicted wearing a radiant sun crown, whose spikes rise prominently above a carefully delineated hair arrangement. Postumus is shown with a mature, heavily bearded countenance, adopting the classical philosopher-soldier appearance established during the Antonine and Severan periods rather than the clean-shaven portraiture common to several preceding soldier-emperors. The catalogued type encompasses two distinct stylistic treatments of the emperor's garments: a radiate bust that is draped, or a radiate bust that is both draped and cuirassed. In the draped variant, the folds of the paludamentum are fastened across the shoulder, conveying civilian majesty combined with executive authority. In the draped and cuirassed variant, the stiff plate or scales of military body armor peek beneath the cloak, reinforcing Postumus's direct role as the supreme commander of the Rhine frontier forces. The portraiture is celebrated in Roman numismatics for its high relief and careful plastic modeling, setting early Gallic issues apart from the increasingly schematic and stylized busts produced concurrently in Rome and Mediolanum.

Reverse Iconography of Jupiter Propugnator

The reverse of RIC V Postumus 70 is dedicated to Jupiter in his martial aspect as the champion and defender of the state. The figure of Jupiter is rendered dynamically, striding actively toward the left while turning his head back toward the right. His muscular torso is presented in motion, emphasizing divine readiness for war. In his right hand, raised high, Jupiter clasps a stylized winged thunderbolt, poised to strike down enemies of the realm, while his left hand is extended outward in a gesture of authority and divine protection. This specific mythological composition draws directly upon classical Roman prototypes of Jupiter Stator and Jupiter Propugnator, which had long been employed by emperors facing grave external or internal existential threats. For Postumus, this motif served as urgent political theology. By invoking the champion of the Olympian pantheon, the regime proclaimed that divine favor guarded the Gallic frontiers against Germanic invaders and defended the secessionist state from punitive campaigns launched by the central emperor Gallienus. The reverse fields of RIC V Postumus 70 are typically clear of control marks, officina letters, or mint signatures, which were only sporadically integrated into earlier Gallic series compared to later third-century issues.

Inscriptions and Epigraphic Analysis

The epigraphy of RIC V Postumus 70 adheres to standard Latin imperial titulature while introducing concise regional messaging. The obverse legend reads IMP C POSTVMVS P F AVG, an abbreviation for Imperator Caesar Postumus Pius Felix Augustus. The title Imperator identifies Postumus as supreme military commander, while Caesar and Augustus confirm his absolute sovereign authority within his territories. The dual epithets Pius and Felix, meaning dutiful and fortunate, were standard elements of Roman imperial legitimacy, claiming devotion to the gods, the state, and the army, alongside divine blessing. The reverse inscription reads IOVI PROPVGNAT, an abbreviated dative form of Iovi Propugnatori, translating to 'To Jupiter the Defender' or 'To Jupiter the Champion.' The dative case establishes the coin type as a public dedication or votive tribute to the deity. Lettering on the dies is rendered with neat, upright serifed capitals typical of early Gallic die-cutting. The engravers maintained clean inter-letter spacing around the perimeter of the die, rarely allowing the lettering to blend into the beaded borders, although uneven striking on narrow flans frequently clipped portions of the marginal inscriptions in mass production.

Typological Sequences and Dating Frameworks

In the chronological system devised by Percy H. Webb in Roman Imperial Coinage, RIC V Postumus 70 was given a broad emission span encompassing the entire reign of Postumus from AD 260 through 269. Webb organized the Gallic coinage largely by thematic legend types and nominal mint attributions, which left individual issues loosely dated within broad reign boundaries. Later chronological revisions, anchored by the die-link and hoard sequencing of Georg Elmer and expanded in the hoard publication of Cunetio by Edward Besly and Roger Bland, provided a narrower framework. Elmer assigned the IOVI PROPVGNAT series to the early phases of Postumus's reign, placing it within the initial sequence struck around AD 260 or 261 during the stabilization of his regime and the early defensive campaigns against Germanic warbands. Typologically, RIC V Postumus 70 must be distinguished from related Gallic issues featuring Jupiter, such as types with IOVI STATORI or IOVI VICTORI legends, as well as distinct reverse variants depicting Jupiter standing stationary or accompanied by an eagle. Die studies demonstrate that the obverse dies used for this issue also shared obverse links with contemporaneous reverse types invoking Hercules, Victory, and Pax.

Hoard Evidence and Regional Circulation

Coin finds and archaeological excavations demonstrate that RIC V Postumus 70 circulated extensively across the provinces of Gaul, Britain, and adjacent territories along the Rhine frontier. The coin is prominently represented in major third-century monetary deposits throughout western Europe. A premier example is the massive Cunetio hoard discovered in Wiltshire, England, in 1978, which contained tens of thousands of radiate coins and documented the extensive circulation and accumulation of Postumus's antoniniani within Roman Britain. Because Postumus's initial issues contained noticeably higher intrinsic silver content than the rapidly collapsing coinages of Gallienus in Italy and the eastern provinces, Gallic antoniniani were eagerly hoarded and carefully curated by populations in the western provinces. Gresham's law led many individuals to retain earlier, heavier Postumus radiates while spending increasingly adulterated billon issues. Even after the collapse of the Gallic Empire in AD 274 under Tetricus I and the reunification of the empire by Aurelian, coins of this type lingered in regional currency pools for decades, frequently appearing in mixed fourth-century context hoards alongside barbarous radiates and reformed Aurelianic nummi.

References

1. The Cunetio Hoard: Roman Coinage of the Third Century AD. pp. 47-58
2. Die Kleingeldreform des Postumus. pp. 1-98
3. Online Coins of the Roman Empire: RIC V Postumus 70. ric.5.post.70
4. The Roman Imperial Coinage, Volume V, Part II. p. 343, no. 70