Balbinus Silver Antoninianus

Monetary Context and the Reintroduction of the Antoninianus

The production of antoniniani under Balbinus in AD 238 represents one of the most consequential decisions in third-century Roman monetary policy. Originally introduced in AD 215 by Caracalla as a tariffed two-denarius piece weighing approximately one and a half denarii, the radiate denomination had been abandoned toward the close of Elagabalus's reign and remained absent from regular production under Severus Alexander. When the Roman Senate revolted against Maximinus Thrax in AD 238 and elected Balbinus and Pupienus as co-emperors following the deaths of Gordian I and Gordian II, the state faced acute fiscal pressure. Raising and supplying senatorial armies in northern Italy while placating the plebs and Praetorian Guard required enormous quantities of silver coin. Rather than maintaining the traditional, higher-purity denarius standard alone, the imperial mint revived the antoninianus. This allowed the administration to stretch limited silver bullion reserves by issuing coins that traded at a premium relative to their intrinsic metal content. The antoniniani struck for Balbinus and Pupienus averaged approximately 4.0 to 4.5 grams with an alloy hovering near 45 to 50 percent silver. This revival initiated a permanent shift in the imperial monetary system: while traditional denarii were still struck alongside the radiate pieces in limited numbers, the antoninianus immediately became the primary denomination of military payouts and the backbone of imperial silver currency, a status reinforced shortly thereafter under Gordian III.

Mint Organization and Production Volume

All official silver antoniniani of Balbinus were produced at the single imperial mint located in Rome. Surviving evidence indicates that the mint of Rome operated using several organized workshops, or officinae, which divided production between the two Augusti and their newly appointed young Caesar, Gordian III. Given that the joint reign lasted only about three months, from late April or early May until late July or early August of AD 238, the production was exceptionally concentrated. Numismatic die studies, notably those synthesized in Roman Imperial Coinage and subsequent hoard evaluations, show an intensive burst of striking with high die turnover, reflecting an emergency wartime footing. Die axes are predominantly adjusted to regular vertical or near-vertical alignments, conforming to normal Severan mint practice. Although the silver fineness had declined relative to the denarii of the early Severan dynasty, Rome maintained tight administrative control over blank preparation, resulting in reasonably uniform flans and clear strike details despite the haste of production. Traces of surface silver enrichment or chemical blanched finishes are observed across billon radiates of this period to mask base-metal content on newly minted pieces.

Obverse Portraiture and Style

The obverse of the silver antoninianus of Balbinus is distinguished by the radiate crown, the diagnostic iconographic indicator of double-denomination status in imperial Roman numismatics. The portrait of Balbinus presents a mature, heavy-set patrician with fleshy cheeks, cropped curly hair, and a trimmed beard, capturing senatorial gravitas in accordance with the realistic, veristic tradition favored by senatorial circles during the crisis of AD 238. Balbinus is depicted facing right, wearing the radiate crown alongside a draped mantle and military cuirass. Stylistically, the bust conveys an aristocratic and civic air compared to the starkly militaristic, aggressive portraits of Maximinus Thrax, reinforcing the Senate's assertion of constitutional legitimacy. Minor variations in bust treatment occur across the coinage, including differing depths of cuirass drapery and occasional differences in the angle of the radiate solar spikes, but the portraiture remains remarkably consistent across surviving dies, demonstrating that a small, highly disciplined group of master engravers prepared the obverse hubs at the capital.

Reverse Types and Senatorial Iconography

The reverse types of Balbinus antoniniani are singularly focused on themes of collegiate unity and mutual devotion between the co-emperors. Unlike the contemporaneous denarii of Balbinus, which feature allegorical figures such as Providentia, Victoria, and Concordia seated, the antoniniani are dominated by the motif of two clasped right hands (dextrarum iunctio). This ancient symbol of pledge, treaty, and marital or political harmony was adapted to publicize the seamless cooperation of the two senatorial rulers. The four canonical antoninianus reverse types correspond to four virtues: FIDES MVTVA AVGG (Mutual Trust of the Augusti), PIETAS MVTVA AVGG (Mutual Piety of the Augusti), CARITAS MVTVA AVGG (Mutual Charity or Esteem of the Augusti), and AMOR MVTVVS AVGG (Mutual Love of the Augusti). Each type depicts the clasped hands positioned centrally in the field, sometimes accompanied by stylized cuffs or folds of drapery. This intense ideological emphasis on mutual affection was an active propaganda campaign designed to refute rampant rumors of personal rivalry between Balbinus, who was entrusted with civil administration, and Pupienus, who oversaw military forces. Ultimately, the coin slogans proved to be wishful thinking, as mutual distrust persisted until soldiers murdered both men in the imperial palace.

Inscriptions and Epigraphic Analysis

The epigraphy on the antoniniani of Balbinus adheres to formal imperial conventions while affirming senatorial authority. The obverse legend is virtually uniform across the series, reading IMP CAES D CAEL BALBINVS AVG, expanding to Imperator Caesar Decimus Caelius Balbinus Augustus. The inclusion of the praenomen and nomen gentilicium (Decimus Caelius) directly proclaims his noble patrician lineage, an essential component of senatorial legitimacy. The lettering is cleanly cut, classical in serif execution, and arranged clockwise starting from the lower left rim. On the reverse, the legends are explicitly structured to emphasize the duality of the imperial office by terminating with AVGG, the double 'G' signifying two Augusti. The four reverse inscriptions read AMOR MVTVVS AVGG, CARITAS MVTVA AVGG, FIDES MVTVA AVGG, and PIETAS MVTVA AVGG. These legends are notable for introducing the adjective mutuus into standard Roman numismatic typology, framing traditional civic virtues as bilateral commitments between co-rulers rather than unilateral qualities directed outward toward the Roman people or legions.

Typology and Chronological Sequence

Because the joint reign of Balbinus and Pupienus spanned roughly ninety-nine days in AD 238, the chronology of the antoninianus issues cannot be subdivided into long annual phases. Instead, scholars date the entire emission to the late spring and early summer of AD 238. Catalogued in modern typology primarily under Harold Mattingly and Edward Sydenham in Roman Imperial Coinage Volume IV, Part 2, the silver radiates of Balbinus comprise catalogue numbers 10 through 13: RIC 10 (AMOR MVTVVS AVGG), RIC 11 (CARITAS MVTVA AVGG), RIC 12 (FIDES MVTVA AVGG), and RIC 13 (PIETAS MVTVA AVGG). The types were struck concurrently with identical clasped-hand reverses produced for Pupienus, indicating that pairs of reverse dies were shared or created in parallel for both rulers within the Rome workshops. There are no securely attested lifetime antoniniani of Balbinus bearing consular or tribunician numbers, as the rapid unfolding of events precluded the accumulation of iterated annual magistracies. Die-linking studies demonstrate that the four reverse slogans were minted in parallel rather than in a strict chronological sequence, functioning as a thematic suite issued simultaneously to ensure wide ideological distribution.

Hoard Evidence and Monetary Circulation

Despite the brief duration of their production, antoniniani of Balbinus circulated widely across the Roman provinces, driven by the frantic military movements of the civil war of AD 238 and the subsequent Persian campaigns under Gordian III. These radiates are documented in numerous third-century hoards across Italy, Gaul, Britain, and the Balkan frontier, such as the famous Dorchester hoard and various mid-third-century Rhine and Danube military deposits. Because they contained substantially more silver than the severely debased radiates of the late 250s and 260s under Valerian and Gallienus, Balbinus antoniniani were subject to intense hoarding according to Gresham's Law. Many pieces remained in active circulation for several decades, accumulating moderate to heavy wear, until the massive hyperinflationary debasements of the mid-260s drove earlier billon coins completely into concealment or melting pots. In modern collections and hoard samples, Balbinus antoniniani appear in modest but regular numbers, establishing that mint output during those ninety-nine days was remarkably high in order to fund the senatorial war effort.

References

1. The Imperial Roman World: Hoards and Coin Circulation in the Third Century AD. pp. 195-218
2. The Roman Imperial Coinage: The Imperial Age from 193 to 476 AD. pp. 310-315
3. Coinage in the Roman Economy, 300 B.C. to A.D. 700. pp. 125-148
4. Roman Coins from the Earliest Times to the Fall of the Western Empire. pp. 128-135
5. The Roman Imperial Coinage, Vol. IV, Part II: Macrinus to Pupienus. pp. 165-177