Postumus Antoninianus RIC V Postumus 310

Monetary Context and the Gallic Currency System

The antoninianus designated as RIC V Postumus 310 emerged from the fragmented political landscape of the mid-third century AD. Following the capture of Emperor Valerian by the Sasanian Empire in AD 260, Roman authority fractured across multiple geographic zones. In Gaul, the military commander Marcus Cassianius Latinius Postumus seized power, forming an autonomous administration known modernly as the Gallic Empire, which encompassed Gaul, the Germanies, Britain, and temporarily Hispania. A cornerstone of Postumus's fiscal strategy was monetary stabilization. While the central Roman administration under Gallienus severely degraded the silver content of the antoninianus down to marginal levels of approximately five to ten percent, Postumus maintained a comparatively elevated silver alloy of roughly fifteen to twenty percent early in his reign. This deliberate policy was designed to secure the loyalty of the Rhine frontier legions and establish civic confidence in the new regime. The antoninianus served as the workhorse denomination of this system, functioning as a tariffed double denarius identified by the emperor's radiate crown. RIC V Postumus 310 belongs to this specialized monetary environment, functioning as both an instrument of military payroll and a medium for imperial propaganda asserting stability, traditional virtues, and divinely sanctioned authority.

Production Standards and Mint Attribution

Early twentieth-century catalogues, notably the initial classification in Roman Imperial Coinage Volume V, frequently assigned the bulk of Postumus's principal coinages to an uncertain workshop or tentatively to Lugdunum (modern Lyon). However, comprehensive die analyses and hoard re-examinations initiated by Georg Elmer and developed by subsequent researchers have firmly established Cologne (Colonia Claudia Ara Agrippinensium) as the primary mint responsible for this emission. Cologne served as Postumus's capital and chief administrative center along the Rhine frontier, operating several dedicated workshops (officinae) capable of large-scale die engraving and striking. The physical standards of RIC V Postumus 310 adhere to the typical Gallic antoninianus metrics of the 260s AD. Although individual flans exhibit variations due to al marco striking, the typical target weight for antoniniani of this period hovered between 2.8 and 3.5 grams, struck on flans measuring approximately 18 to 22 millimeters in diameter. The alloy consists of a low-grade silver-copper mixture (billon), which was often subjected to chemical surface blanching (pickling) prior to striking. This enrichment technique depleted copper from the outer surface of the flan, imparting a bright silver sheen when newly minted, though normal abrasive circulation eventually exposed the baser underlying metal.

Obverse Iconography: Radiate Bust with Herculean Attributes

The obverse of RIC V Postumus 310 represents one of the most iconographically complex portraits produced within the Gallic series. The emperor is depicted in a radiate bust facing left, draped, bearing the club of Hercules over his shoulder and draped in the skin of the Nemean lion. Left-facing busts are markedly less common than standard right-facing portraits in third-century Roman coinage, typically indicating an issue of special ideological significance, donative distribution, or refined workshop execution. By assimilating his portraiture with the physical accoutrements of Hercules, Postumus explicitly fused imperial majesty with divine heroic labor. Hercules enjoyed profound veneration along the Rhine frontier under localized syncretic epithets such as Hercules Deusoniensis and Hercules Magusanus. The presence of the knotted club resting against the emperor's shoulder and the paws or mane of the lion skin draped across his shoulders framed Postumus not merely as a mortal princeps, but as a tireless protector laboring directly to vanquish barbarians and preserve civilization. The portrait engraving at Cologne demonstrates a robust, mature stylistic treatment characterized by a broad jaw, heavily modeled beard, and meticulously rendered radiate crown spikes.

Reverse Iconography: Jupiter Stator

The reverse iconography of RIC V Postumus 310 presents the classic image of Jupiter Stator. The supreme deity stands facing right, rendered in heroic nudity or light drapery, holding a tall transverse sceptre in his right hand and grasping a thunderbolt in his left hand. The cult of Jupiter Stator possessed ancient Roman military roots, traditionally associated with the miraculous halting of retreating troops and the renewal of battlefield steadfastness. In the context of Postumus's regime, which faced relentless Germanic incursions from across the Rhine as well as internal Roman political hostility, the invocation of Jupiter Stator offered a potent theological reassurance. The divine posture holding both the sceptre of governance and the destructive thunderbolt underscored Jupiter's omnipotent guardianship over the Gallic provinces. The composition emphasizes stability through firm, balanced footing and vertical lines, reassuring both civilian communities and military garrisons that the Gallic Empire stood unshaken against external turmoil.

Epigraphy and Legend Structure

The legends on RIC V Postumus 310 are striking in their conciseness and legibility. The obverse legend reads POSTVMVS AVG, an abbreviated formulation of Postumus Augustus. The omission of traditional republican titles, such as Pontifex Maximus, Consul, or Tribunicia Potestas, was a common feature of third-century antoniniani, maximizing letter size and visual impact on the relatively small planchets. The lettering reflects the distinct epigraphic style of the Cologne engravers, featuring crisp, deeply cut serifed capitals. On the reverse, the legend IOVI STATORI occupies the periphery, written in the dative case to signify a dedicatory offering: 'To Jupiter the Stayer' or 'To Jupiter who halts retreat.' This grammatical construction emphasizes the emperor's personal devotion to the god, positioning the imperial administration as a pious client under celestial patronage. No officina marks, control letters, or mint signatures appear in the fields or exergue on this specific type, a convention characteristic of the earlier and middle phases of the Cologne workshop before systematic Greek or Roman workshop lettering became prevalent.

Typology and Chronological Placement

Within the broader typology of Postumus's reign, RIC V Postumus 310 is classified under the broad chronological envelope of AD 260 to 269 in standard reference catalogues. However, relative hoard chronology and stylistic groupings established by modern numismatists locate the emission more precisely within the middle period of his rule, likely between AD 262 and 266. During this phase, Postumus consolidated his territorial borders and issued several coordinated series commemorating traditional protector gods, notably Hercules, Serapis, Neptune, and Jupiter. The Jupiter Stator reverse appears across multiple obverse die varieties, including conventional right-facing radiate heads, but the left-facing bust with club and lion's skin is recognized as a distinct, specialized type. In Georg Elmer's foundational 1941 corpus, the issue is aligned alongside parallel Herculean portrait coinages that accompanied Postumus's recurring celebrations of security and military victory. Because the obverse legend lacks consular dating or tribunician numbers, precise year-by-year attribution relies entirely on die linkage with dated series and stratigraphic hoard evidence.

Circulation, Hoard Evidence, and Monetary Afterlife

RIC V Postumus 310 circulated extensively throughout the territories controlled by the Gallic Empire, with confirmed archaeological finds documented across northern Gaul, the Rhineland, and Britain. Massive hoard deposits, such as the Normanby Hoard and the Cunetio Hoard in Roman Britain, contain representative quantities of Postumus's billon coinage, demonstrating that these coins were heavily integrated into the regional military economy. Because Postumus maintained a superior fineness compared to contemporary emissions of Gallienus, his antoniniani were subject to Gresham's Law phenomena, frequently being hoarded or selectively melted down when later Gallic rulers, particularly Victorinus and Tetricus I, significantly debased their own currencies between AD 269 and 274. The wear patterns on extant specimens of RIC V Postumus 310 range from nearly uncirculated hoard specimens to heavily worn survivors that remained in commercial channels until the monetary reconsolidation of Emperor Aurelian in AD 274, when the Gallic Empire was reabsorbed and vast quantities of provincial billon were officially demonetized or recalled for recoinage.

References

1. The Normanby Hoard and Other Roman Coin Hoards. British Museum Publications
2. Die Münzprägung der gallischen Kaiser in Köln, Trier und Mailand. Bonner Jahrbücher 146, pp. 1-106
3. Online Coins of the Roman Empire: RIC V Postumus 310. ric.5.post.310
4. The Roman Imperial Coinage, Volume V, Part II. p. 364, no. 310