Gallienus Antoninianus, RIC V Gallienus 507: Subtype 4

Monetary Context and the Crisis of the Sole Reign

The issue of RIC V Gallienus 507: Subtype 4 falls squarely into one of the most volatile economic and political passages in Roman imperial history. Following the catastrophic defeat and capture of Emperor Valerian I by the Persian king Shapur I near Edessa in AD 260, Gallienus assumed sole command of a fragmented empire. In the West, Postumus broke away to establish the independent Gallic Empire, severing Gallienus from vital mints such as Lugdunum and Cologne as well as the silver-producing regions of Roman Iberia and Britain. In the East, local commanders and the burgeoning power of Palmyra carved out regional autonomy. Gallienus was left to defend the central Mediterranean provinces, Italy, North Africa, and the Balkan frontier against relentless barbarian incursions and successive military revolts. To finance constant military campaigns and sustain the loyalty of the field armies, imperial fiscal authorities relied on drastic reductions in the intrinsic value of the principal silver denomination, the radiate coin commonly termed the antoninianus. Initially introduced under Caracalla in AD 215 as a double denarius with a fine silver content of roughly fifty percent, the antoninianus by AD 260 had fallen below twenty percent purity. Under the fiscal emergencies of Gallienus's sole reign, the alloy deteriorated at an unprecedented rate, dropping from approximately fifteen percent silver in AD 260 to under three percent toward the end of his reign in AD 268. Subtype 4 belongs to this period of severe debasement. To conceal the predominantly copper core, mint workers subjected blank flans to chemical blanching, pickling the blanks in an acidic solution to leach out surface copper and create a thin, enriched silver wash. Once in circulation, this superficial silver plating rapidly wore away, leaving the dark, cupric core exposed.

Production and the Mediolanum Mint

RIC V Gallienus 507 was produced exclusively at the Mediolanum mint, established late in the joint reign of Valerian and Gallienus around AD 258 to AD 259. Positioned south of the Alps at the intersection of critical transit corridors between the Rhine frontier, the Danube, and peninsular Italy, Mediolanum quickly evolved into an indispensable military capital. Gallienus based his newly reorganized mobile cavalry reserve (the comitatus) at Mediolanum, making the local mint the primary paymaster for frontline troops defending northern Italy from Germanic incursions and guarding against incursions from the Gallic usurpers. The workshop arrangements at Mediolanum were organized into numbered or lettered officinae (workshops). While earlier and later series from Mediolanum frequently bore explicit officina markings in the fields or exergue, many emissions belonging to type 507 were struck without exergual marks or officina letters. Mint workers prepared flans through rapid cast-strip methods, cutting blanks hastily and striking them at elevated speeds. As a consequence of this intense war footing, antoniniani of this type exhibit wide physical variations: typical flans range from approximately 18 to 22 millimeters in diameter, with individual specimen weights fluctuating between 2.0 and 3.5 grams around a theoretical standard of approximately 2.8 to 3.0 grams. Die alignment was predominantly erratic or loosely adjusted to twelve o'clock, reflecting high-output industrial conditions rather than careful artisanal finish.

Obverse Iconography and Subtype Characteristics

The obverse of RIC V Gallienus 507: Subtype 4 presents a right-facing portrait of Gallienus wearing a radiate crown. The radiate crown remained the universal iconographic marker of the double denomination (the antoninianus) since the early third century AD, associating the emperor with the divine solar radiance of Sol. In keeping with the distinctive Mediolanum style, the portrait displays a compact, muscular neck, short clipped beard, and a stylized cap of curls held beneath the spiked crown. The engraving style of Mediolanum is generally recognized by its bold, angular profiles and large, expressive facial features, differing markedly from the softer, more classical modeling practiced at the Rome mint. Subtype 4 is specifically defined by its portrait truncation. Whereas other varieties of RIC V Gallienus 507 present the emperor with drapery or military cuirass visible at the base of the neck (such as radiate, draped or radiate, draped and cuirassed busts), Subtype 4 is strictly limited to the bare radiate head, terminating cleanly above or at the neckline without fabric or armor. The field around the portrait is enclosed by a beaded border, frequently off-center due to rapid manual striking.

Reverse Iconography of Pietas

The reverse of the coin depicts Pietas, the personification of religious duty, filial loyalty, and conscientious devotion to both the gods and the state. Pietas stands draped, facing left, positioned beside a low sacrificial altar. Her arms are raised and outspread in the traditional Roman orans posture of prayer and supplication over the altar. The altar itself is rendered as a simple rectangular block or tripod-like base, occasionally showing stylized flames or incense smoke rising from its top. In the crisis-laden atmosphere of the 260s AD, the depiction of Pietas served an ideological function. Beset by military catastrophes, plagues, and civil rebellion, the imperial administration utilized reverse types to invoke divine favor and project moral legitimacy. By depicting the emperor's reciprocal devotion (pietas) toward the traditional Roman pantheon, the coinage affirmed that the survival of the state rested on the restoration of the pax deorum (peace with the gods). Unlike reverse types depicting martial deities like Mars or Victoria, the Pietas motif offered a message of spiritual renewal, traditional virtue, and civil harmony directed at both the provincial populace and the legionary ranks.

Epigraphy and Legends

The legends on RIC V Gallienus 507: Subtype 4 are concise and formulaic, conforming to the standardized epigraphic program developed during Gallienus's sole reign. The obverse carries the legend GALLIENVS AVG, moving clockwise along the rim. This minimal title represents a dramatic truncation compared to earlier third-century titular formulas that enumerated consulships, tribunician powers, and imperial acclamations. By omitting elaborate military epithets and ancestral references, the brief inscription saved die-engraving time and maximized legibility on increasingly narrow flans. The reverse bears the legend PIETAS AVG, abbreviating Pietas Augusti ("the Piety of the Emperor"). The letters are engraved in bold, upright Roman capitals, typical of the Mediolanum die-cutters who favored sharp vertical strokes and open curves. The reverse field is typically devoid of mint letters or control symbols on this specific subtype, though the layout occasionally leaves the altar off-center or compresses the right-hand letters depending on die execution.

Typology and Chronological Classification

In the foundational organization of Percy H. Webb in Roman Imperial Coinage Volume V, Part I (1927), number 507 encompasses multiple bust variants paired with the GALLIENVS AVG / PIETAS AVG design struck at Mediolanum. Modern cataloguing systems such as the Online Coins of the Roman Empire (OCRE) differentiate these varieties into distinct subtypes based on obverse bust treatments. Subtype 4 denotes the bare radiate head right, distinguishing it from Subtype 1 (radiate, draped right), Subtype 2 (radiate, cuirassed right), and Subtype 3 (radiate, draped and cuirassed right). Chronologically, Robert Göbl's comprehensive die and emission study (Moneta Imperii Romani 36) situated the Mediolanum Pietas issues within the central phases of Gallienus's sole reign, broadly dated between AD 260 and AD 268. More refined internal dating places the issue within Gallienus's mid-reign reorganizations at Mediolanum, approximately AD 262 to AD 265, prior to the large-scale introduction of consistent officina letter marks (such as P, S, T, or MP, MS, MT) that characterized the final production phases before Gallienus's assassination outside Mediolanum in AD 268.

Circulation, Hoard Evidence, and Survival

Antoniniani of the Mediolanum mint circulated widely across the western and central provinces of the Roman Empire, despite the political fracture represented by the Gallic Empire. Huge numbers of Gallienic billon coins traveled with military detachments into the Danubian frontier zones, the Balkans, and peninsular Italy. Significant quantities also crossed border zones into Roman Britain and Gaul, where they were integrated into the vast hoards buried during the turbulent decades of the late third century AD. Major hoard assemblages across Europe, such as the Cunetio and Normanby hoards in Britain and numerous continental deposits in northern Italy and the Rhineland, contain large representations of Gallienus's Mediolanum billon issues. Because these coins possessed negligible silver content, the public routinely hoarded them in enormous ceramic containers as inflationary currency before the reform of Aurelian in AD 274 introduced the radiate aurelianianus. Today, antoniniani of type 507 are well attested in both institutional holdings and private collections, though specimens of Subtype 4 retaining complete silvering or clear unclipped borders remain comparatively scarce.

References

1. Coin Hoards and Hoarding in the Roman Empire. Chapter 4: The Debasement of the Antoninianus in the Reign of Gallienus
2. Die Münzprägung der Kaiser Valerianus I., Gallienus, Saloninus (253/268), Regalianus (260) und Macrianus/Quietus (260/262) (MIR 36). Mediolanum issues, sole reign (AD 260-268)
3. RIC V Gallienus (2) 507.4 in Online Coins of the Roman Empire. ric.5.gall(2).507.4
4. The Roman Imperial Coinage, Vol. V, Part I: Valerian to Florian. pp. 176-177, no. 507