Gallienus Antoninianus, RIC V Gallienus 575k: Subtype 2

Monetary Context and the Crisis of the Third Century

The antoninianus struck under Gallienus between AD 260 and 268 belongs to one of the most volatile economic phases in the history of imperial Roman coinage. Following the capture of Gallienus's father and co-emperor Valerian by Shapur I in AD 260, Gallienus reigned as sole Augustus over an empire fractured by internal usurpations and external invasions. The central imperial administration lost control of the northwestern provinces to the Gallic Empire founded by Postumus, while eastern territories fell increasingly under the de facto control of the Palmyrene leadership. Facing massive logistical obligations and continuous military campaigning, the imperial treasury rapidly depleted its stores of bullion. Consequently, the radiate fraction, which had been introduced under Caracalla at an alloy of over fifty percent fine silver, deteriorated into a heavily alloyed billon coin containing minimal precious metal, frequently dipping below five percent silver. The coin functioned within a disrupted bimetallic system wherein gold aurei were struck on fluctuating, reduced weight standards, and regular aes base-metal denominations were largely suspended or produced in negligible quantities. To preserve the appearance of a silver coin, mints treated these debased blanks with chemical leaching techniques or thin superficial silver washes that rapidly wore away in circulation. The issue of RIC V Gallienus 575k: Subtype 2 operated within this fiscal environment, serving as low-value, high-velocity military currency necessary to sustain the central Roman armies stationed along the Danubian defensive line.

Production and the Siscia Mint

The establishment of an imperial mint at Siscia (modern Sisak, Croatia) represents one of the major administrative and military developments of Gallienus's sole reign. Founded around AD 262 in Pannonia Superior, Siscia was ideally positioned near the confluence of the Sava and Kupa rivers, offering superior logistical connectivity to the Balkan garrisons and the northern frontier armies defending against Germanic tribal incursions. The mint reduced reliance on the long-established urban workshops of Rome and Mediolanum (Milan), bringing money supply operations directly to the rear of active military sectors. Production at Siscia was organized into multiple operational workshops or officinae, which would later systematically sign their issues with Greek or Latin letters and auxiliary symbols. Although RIC V 575k: Subtype 2 carries no explicit mintmark on its recorded flan, its stylistic execution, lettering forms, and portrait treatment identify its Siscia origin within third-century corpora. The manufacturing process was characterized by rapid, high-volume striking under intense fiscal pressure, resulting in occasional irregular flans, variable striking pressure, and slight off-centering, yet the Siscia die-engravers maintained a distinctive, crisper portrait style relative to contemporary provincial irregular workshops.

Obverse Iconography

The obverse of RIC V Gallienus 575k: Subtype 2 features the radiate head of Gallienus facing right. In the traditional typology of the Roman Imperial Coinage, the letter notation 'k' indicates an unadorned head facing right wearing the radiate crown, rather than a bust with drapery or cuirass (which are designated by other letters such as 'a', 'b', or 'f' in the RIC scheme). The radiate crown remains the defining iconographic attribute of the antoninianus or double-denarius denomination, symbolizing the divine brilliance of Sol and serving as a quick visual marker for a coin originally tariffed at two denarii. Gallienus's portraiture at Siscia is characterized by an idealized yet compact profile, displaying short, neatly curled hair, a clipped beard, and a firm jawline. This mature portraiture contrasts with the earlier, more expansive co-emperor issues produced jointly with Valerian. The omission of heavy drapery or cuirass presents the emperor in a simplified, dignified fashion, focusing visual attention on imperial authority and divine radiance.

Reverse Iconography and Symbolism

The reverse design presents Pax, the Roman personification of peace, standing facing left. She is depicted draped in long, flowing garments, holding an extended olive branch in her raised right hand and a transverse or upright sceptre in her left. The personification of Pax was one of the most prolific reverse types of the third century, operating as imperial propaganda rather than an objective depiction of reality. During the 260s, peace was absent throughout the empire; Gallienus fought concurrent wars against barbarian invaders, the rebel regime in Gaul, and usurpers in the Balkans and the East. Invoking Pax Augusta on state coinage served to reassure both civil society and the military that the legitimate Augustus was the guarantor of tranquility, divine order, and military victory. The juxtaposition of the olive branch, an ancient emblem of reconciliation and restored order, with the sceptre, the symbol of legitimate sovereignty and command, conveyed that peace could only be achieved and maintained through the sovereign authority of the emperor.

Epigraphy and Legends

The legends on this subtype are concise and follow the standard formula used in Gallienus's sole reign. The obverse bears the inscription GALLIENVS AVG, an abbreviated form of 'Gallienus Augustus'. This shortened titling represents a marked shift away from the extended epigraphic formulas of the early empire and the joint reign, which previously included detailed references to imperatorial acclamations, tribunician power (Tribunicia Potestate), and consulships. The compact legend allowed die-engravers to fit the inscription neatly around the radiate head while prioritizing swift die manufacture. The reverse carries the legend PAX AVG, contracting 'Pax Augusti' (The Peace of the Emperor). This legend binds the concept of peace directly to the imperial person. Epigraphically, Siscia issues from this period exhibit clean, upright Latin lettering with sharp serifs and moderate spacing, distinguishing the output from the cruder lettering found on contemporary barbarous radiates and certain hurried issues from the central mint of Rome.

Typology and Chronological Classification

In the fundamental classification of Percy H. Webb in Roman Imperial Coinage Volume V, Part I, number 575 encompasses the general type of Gallienus's sole-reign antoniniani from Siscia bearing the reverse PAX AVG with Pax standing left holding an olive branch and sceptre. The typology is differentiated by obverse bust forms and subordinate reverse control marks. Bust variety 'k' specifically denotes the head radiate right. Within modern computerized numismatic databases such as Online Coins of the Roman Empire (OCRE), subtype designations (such as Subtype 2) define specific die or control variations recorded across public collections, separating unmarked issues from those carrying field marks or varying obverse treatments. In Robert Göbl's comprehensive corpus of the coinage of Valerian and Gallienus (MIR 36), the Siscia issues with Pax standing left are situated within the chronological phases of AD 262 to 268, with peak production concentrated between AD 265 and 268 when the Pannonian mint operated at full capacity prior to Gallienus's assassination outside Mediolanum in the autumn of AD 268.

Circulation, Hoards, and Archaeological Context

Antoniniani of Gallienus struck at Siscia circulated extensively throughout the central Mediterranean, the Danubian provinces, and northern Italy, with stray specimens penetrating the British Isles and western Europe through trade and army reallocations. Because the silver content of these coins had fallen to around two to five percent, Gresham's law led older, finer antoniniani of the Severan, Gordianic, and Decian periods to be systematically hoarded, melted down, or removed from general circulation. In contrast, the debased billon radiates of the late 260s circulated rapidly in enormous quantities as token currency. Major coin hoards from the western and central provinces, such as the Cunetio and Normanby hoards in Roman Britain as well as numerous central European deposits, contain substantial representations of Gallienus's Siscia radiates. These hoards demonstrate that despite regional political fragmentation, billon radiates crossed internal frontiers, remaining in general circulation until the monetary reforms of Aurelian in AD 274 and the eventual currency reorganizations under Diocletian in AD 294.

References

1. Coin Hoards and Hoarding in the Roman Empire. Third-Century Radiate Circulation and Hoard Patterns
2. Die Münzprägung der Kaiser Valerianus I. / Gallienus / Saloninus (253/268). Moneta Imperii Romani 36, Siscia Issues
3. RIC V Gallienus (2) 575k: Subtype 2. Type Record ric.5.gall(2).575k.2
4. The Roman Imperial Coinage, Volume V, Part I: Valerian to Florian. pp. 177, no. 575