Gallienus Silver Antoninianus, RIC V Gallienus 460: Subtype 2

Monetary Context and Debasement

The antoninianus, or double denarius, introduced in AD 215 by Caracalla, constituted the primary silver denomination of the mid-third century Roman monetary system. By the reign of Valerian and Gallienus between AD 253 and AD 260, the denomination had effectively supplanted the classical silver denarius as the chief coin for imperial disbursements and military pay. The ongoing military emergencies confronting the empire, including multiple frontier incursions along the Rhine and Danube and protracted conflicts with the Sasanian Empire, exerted catastrophic pressures on the imperial fiscus. To sustain the expanded legions and cavalry reserves, imperial authorities repeatedly lowered the silver purity of the coinage. During the early joint reign, the silver fineness of the antoninianus hovered around forty percent, but by AD 259, when RIC V Gallienus 460: Subtype 2 was struck, ongoing debasement had reduced the fineness to approximately twenty to twenty-five percent silver, alloyed heavily with copper and traces of tin or lead. The physical antoninianus retained a superficial silvery appearance through blanching or surface enrichment during flan production, in which chemical pickling in acidic solutions removed surface copper oxides before striking. While earlier generations of scholars considered these coins formal silver issues, modern numismatic classification acknowledges them as billon issues on the eve of the cataclysmic financial crisis that followed the capture of Valerian in AD 260.

Production and the Mint of Mediolanum

The establishment of the imperial mint at Mediolanum represented a critical strategic shift in third-century Roman coin production. Historically, the mint of Rome held a virtual monopoly over western European coin production, with occasional provincial issues struck in Viminacium, Antioch, or Lugdunum. Around AD 258 or AD 259, Gallienus created a specialized mint facility at Mediolanum, situated strategically south of the Alps in Cisalpine Gaul. This facility was established primarily to supply freshly minted coin to the newly created mobile equestrian cavalry corps and imperial field armies (comitatus) stationed in northern Italy to intercept Alamannic and Juthungian raiders who had pierced the Rhaetian limes. RIC V Gallienus 460: Subtype 2 reflects the rapid operational startup of this facility. The dies were engraved by competent artists whose work displays sharp, distinct stylistic characteristics, including relatively compact, severe portraiture and neat lettering that differentiate Mediolanum issues from contemporary products of Rome and Cologne. The mint did not yet employ the systematic officina marks or mint signatures, such as MP or MS, which became standard later during Gallienus's sole reign, meaning attribution relies upon iconographic style, flan morphology, and epigraphic continuity with documented Mediolanum issues.

Obverse Typology and Portraiture

The obverse design of RIC V Gallienus 460: Subtype 2 presents a right-facing portrait of Gallienus crowned with the radiate crown, the conventional numismatic signifier indicating a double-denomination piece, such as the antoninianus or dupondius. In Subtype 2, the portrait is specifically restricted to a bare head, truncating cleanly at the neck without the paludamentum, cuirass, or associated drapery found on other concurrent emissions. Gallienus is depicted in middle age, with closely cropped hair, a neatly delineated short beard, and focused facial features characteristic of the realistic transitional portraiture of the late 250s AD. This unadorned head style emphasizes direct imperial presence over elaborate military costume. The engraving exhibits the high relief and tidy finishing of Mediolanum's initial engravers, with precise radial spikes extending from the central diadem ring. The portrait is framed by a linear border of dots within which the inscription is centered evenly around the head.

Reverse Iconography and Pietas Imagery

The reverse of Subtype 2 portrays Gallienus as chief priest of the Roman state, performing an act of public religious devotion. Dressed in the traditional toga with the hood drawn over his head as velato capite, the emperor stands facing left. In his extended right hand, he holds a shallow offering dish or patera, from which he pours a libation onto a lighted, garlanded altar standing at his feet to the left. In his left hand, tucked close to his side, he holds a short sceptre, an attribute of both divine authority and consular dignity. This iconography draws heavily upon the classical Pietas visual repertoire established under the early Principate, reasserting the ruler's scrupulous observance of ancestral religious duties (pietas erga deos). At a time of intense external barbarian pressure and internal social anxiety, such imagery was designed to project political legitimacy, order, and the essential divine favor of the Olympian gods for the continued survival of the empire.

Epigraphy and Titulature

The obverse legend reads IMP GALLIENVS AVG, an abbreviated form of Imperator Gallienus Augustus. By omitting the traditional praenomen Licinius or the patronymic elements common in formal epigraphy, this legend maintained a concise formula suitable for the restricted perimeter of a reduced antoninianus flan. The reverse legend reads P M TR P VII COS, expanding to Pontifex Maximus, Tribunicia Potestate VII, Consul. This inscription provides vital chronological evidence: it confirms Gallienus's position as supreme pontiff, records his seventh renewal of tribunician power, and references his attainment of the consulship. Unlike many antoniniani that rely on broad personifications such as Pax, Victoria, or Fides, this emission is purely epigraphic and regnal in character, binding the emperor's civic and sacral magistracies directly to the sacrificial portrait on the reverse. Lettering on both faces is crisp and disciplined, featuring upright classical capital letters characteristic of early Mediolanum die-cutters.

Typology and Chronological Placement

In the standard classification established by Percy H. Webb in Roman Imperial Coinage Volume V, Part 1, RIC 460 is categorized under the joint reign issues struck at Mediolanum bearing the reverse legend P M TR P VII COS. Within this entry, modern catalogue typology distinguishes two primary portrait varieties: Subtype 1 features a radiate, draped and cuirassed bust, whereas Subtype 2 isolates the radiate head right without drapery or armor. Robert Gobl's comprehensive corpus of Gallienic coinage places these dated tribunician emissions into his Issue 1 or early Issue 2 of Mediolanum, firmly situated in AD 259. Gallienus held his seventh tribunician renewal during this calendar period before assuming his eighth renewal in late AD 259 or early AD 260. The appearance of COS without an explicit numeral reflects the traditional third-century numismatic shorthand when the current year did not coincide with a new consular inauguration, Gallienus having served his third consulship in AD 257. Subtype 2 therefore represents an exact, tightly dated issue produced immediately prior to the military catastrophe in the East that ended the joint reign.

Circulation, Hoard Evidence, and Survival

Issues of RIC V Gallienus 460, including Subtype 2, saw active circulation across northern Italy, Gaul, the Alpine provinces, and the Danubian frontier zones where Gallienus concentrated his forces. Because of their modest silver content, these late joint-reign coins remained circulating currency alongside earlier antoniniani until the massive influx of heavily degraded base-metal antoniniani during Gallienus's sole reign between AD 260 and AD 268. Following the post-260 hyper-debasement, earlier billon pieces with silver content above twenty percent were frequently hoarded and withdrawn from everyday transactions, leading to Gresham's Law sorting. Consequently, specimens of Subtype 2 are documented in western European hoards such as the Cunetio and Normanby deposits in Britain and corresponding deposits across France and Germany. Although RIC 460 as a broader dated type is well recognized in major collections, Subtype 2, with the bare radiate head, represents a distinct die variety that appears less frequently in hoard analyses than the standard draped and cuirassed bust types.

References

1. The Cunetio Treasure: Roman Coinage of the Third Century AD. pp. 23-45
2. Coin Hoards and Hoarding in the Roman Empire. pp. 87-112
3. Die Munzpragung des Kaisers Gallienus. Moneta Imperii Romani 36, Mediolanum
4. Coining Images of Power: Representations of New Emperors on the Roman Coinage, AD 193-284. pp. 165-174
5. Online Coins of the Roman Empire: RIC V Gallienus 460: Subtype 2. ric.5.gall(2).460.2
6. The Roman Imperial Coinage, Volume V, Part 1: Valerian to Florian. p. 176, no. 460