Gallienus Silver Antoninianus, RIC V Gallienus 156k

Monetary Context and Debasement

The emission of RIC V Gallienus 156k took place during one of the most turbulent epochs in Roman monetary history. By AD 268, the Roman Empire was fractured into competing administrative zones, with the Postumian Gallic Empire controlling Gaul and Britain, and the Palmyrene realm expanding its influence across the eastern provinces. Gallienus operated within a constricted fiscal sphere centered primarily on Italy, the Balkans, and parts of North Africa. To meet spiraling military expenditures required to repel Gothic invasions and sustain protracted civil wars, the imperial administration accelerated the debasement of the principal base-silver denomination, the antoninianus or radiate double denarius. Although numismatic references such as the Roman Imperial Coinage catalog the metal as silver (AR), metallurgical analyses demonstrate that radiates produced at Rome in AD 268 rarely contained more than two to four percent fine silver. The mint relied on copper-tin-lead alloy blanks that received a fleeting chemical or depletion-silvering wash prior to or immediately following striking. RIC V Gallienus 156k represents the culmination of this debasement trajectory, functioning as a fiat currency whose nominal purchasing power was enforced by imperial decree rather than intrinsic metallic worth.

Production and Mint Operation

Production of RIC V Gallienus 156k was concentrated exclusively at the principal imperial mint in Rome. During the final phase of Gallienus's reign, the Rome mint was organized into a sophisticated twelve-officina system, each workshop assigned specific reverse designs, identifying marks, or distinct series. The striking of dated administrative issues like type 156k operated alongside the massive animal and mythological series dedicated to imperial tutelary deities (the 'Consacratio' and protective gods sequence). Blank preparation in AD 268 was executed with great haste: flans were frequently cast in multiple-cavity molds, resulting in irregular edges, noticeable casting sprues, and wide fluctuations in module. Individual weights for these antoniniani typically span between 2.20 and 3.50 grams, with a central cluster near 2.70 grams, though significant outliers exist. Dies were carved with rapid, efficient strokes by experienced celators, prioritizing legible imperial portraiture and unambiguous administrative titles over refined artistic nuance.

Obverse Design and Portraiture

The obverse of RIC V Gallienus 156k features the radiate head of Gallienus turned to the right. Unlike related variants in the 156 sequence that display a draped, cuirassed, or fully armored bust, variant 'k' in Percy Webb's classification is defined specifically by an unadorned head wearing only the radiate crown. This crown, the traditional iconographic signifier of the double-denomination radiate, also carried deep solar associations with Sol Invictus, emphasizing divine illumination and cosmic victory. Portraiture from the Rome mint in AD 268 shows a mature Gallienus with a short, neatly curled beard, tightly cropped hair, and an upturned, expressive gaze. This stylized rendering reflects the late classicizing revival fostered by Gallienus's court circle, blending philosophical contemplation with the authoritative visage of an embattled supreme commander.

Reverse Iconography and Symbolism

The reverse iconography depicts the emperor standing erect facing left, dressed in a paludamentum and tunic. In his outstretched right hand he supports a celestial globe, while his left hand cradles a vertical sceptre or spear. This composition draws directly on long-established traditions of imperial adventus and cosmic rule. The globe signifies the orbis terrarum, asserting that despite acute territorial fracturing and barbarian pressure, the legitimate Augustus retains universal dominion and cosmic authority over the civilized world. The sceptre underscores his civil and legislative imperium. By presenting Gallienus himself as the cosmic stabilizer rather than relying on an allegorical deity such as Pax, Victoria, or Providentia, the type conveys a direct, personal assertion of monarchical legitimacy and endurance during a critical military juncture.

Legends and Epigraphy

The epigraphic program of RIC V Gallienus 156k is exceptionally precise. The obverse legend reads GALLIENVS AVG, providing a concise nominative attribution naming the emperor Augustus without superfluous laudatory titles. The reverse inscription bears the extended formula P M TR P XVI COS VII, expanding to Pontifex Maximus, Tribunicia Potestate XVI, Consul VII. This formula records Gallienus's supreme pontificate, his sixteenth renewal of tribunician power, and his seventh ordinary consulship. The lettering at the Rome mint in this period is characteristically compact, with tall, slender characters, occasional unbarred A's, and squared C's and G's. The inclusion of explicit regnal reckoning on the reverse separates this issue from the vast bulk of contemporary undated antoniniani, providing modern numismatists with an invaluable epigraphic benchmark.

Typology and Chronology

In the typological framework of Roman Imperial Coinage Volume V, catalog entry 156 encompasses the Rome mint issues of Gallienus celebrating his seventh consulship and sixteenth tribunician power. The lettered sub-varieties (such as 156a through 156k) designate minute distinctions in obverse drapery, cuirassing, and head orientation; type 156k specifically isolates the right-facing radiate head. Robert Göbl, in his definitive study Moneta Imperii Romani (MIR 36), positioned these dated issues into the final Rome mint emission of AD 268. Gallienus assumed his seventh consulship alongside Marinianus on 1 January AD 268. His sixteenth tribunician term commenced in autumn AD 267 or early AD 268, depending on the tribunician renewal system applied at Rome. Consequently, the striking of RIC V Gallienus 156k can be circumscribed tightly to the initial eight or nine months of AD 268, terminating abruptly upon the emperor's assassination at the siege of Mediolanum (Milan) in late summer or early autumn of that year.

Circulation, Hoards, and Deposition

Despite originating at the Rome mint, antoniniani of this type circulated widely through imperial military logistical networks across the central Mediterranean, the Danubian frontier, and Italy. In hoard contexts throughout Italy, the Alpine corridor, and the Balkans, AD 268 dated issues of Gallienus are consistently present, often mixed with older billon radiates from the joint reign with Valerian (AD 253-260) and subsequent issues of Claudius Gothicus (AD 268-270). Because the silver content had fallen so drastically by AD 268, Gresham's law caused earlier, higher-grade billon issues to be hoarded selectively, while low-silver radiates like type 156k dominated everyday transactions and rapid market circulation. Many recovered specimens show pronounced surface wear, loss of original silvering, and occasional die cracks or uneven strikes indicative of wartime emergency production.

References

1. Coin Hoards and Hoarding in the Roman Empire. pp. 85-92
2. Die Münzprägung der Kaiser Valerianus I. / Gallienus / Saloninus (253/268), MIR 36. Rome issue, AD 268
3. Online Coins of the Roman Empire: RIC V Gallienus 156k. ric.5.gall(2).156k
4. The Roman Imperial Coinage, Vol. V, Part I. p. 144, no. 156k