Commodus Copper-Alloy Dupondius

Monetary Context and Denominational System

Within the currency system established by Augustus and maintained throughout the second century AD, the dupondius served as a middle-tier base-metal denomination. Valued at two copper asses, eight dupondii were tariffed to one silver denarius, and two dupondii equaled one brass sestertius. Historically, the Roman state maintained a strict metallurgical hierarchy for aes coinage: the sestertius and dupondius were manufactured from orichalcum, a golden brass alloy composed primarily of copper with varying proportions of zinc, while the as and its subdivisions were struck in red copper. By the reign of Commodus, however, the zinc content in circulating orichalcum had suffered a progressive decline through repeated remelting and fiscal pressures, occasionally narrowing the optical contrast between freshly minted dupondii and asses. To avert public confusion regarding value, the traditional visual convention remained indispensable: emperors appeared with a radiate crown on dupondii, whereas the laurel wreath denoted the sestertius and as. For female imperial relatives, the crescent beneath the bust served an identical denominational function. Dupondii struck under Commodus played an active role in daily commercial exchange, bridging the gap between fractional copper denominations and high-value silver denarii used for major commerce, military stipends, and imperial taxation.

Production Technology and Mint Organization

The dupondii of Commodus were produced virtually exclusively by the central imperial mint in Rome. Operating under the administrative oversight of the rationalis and local equestrian procurators, the Rome mint was divided into multiple distinct workshops, or officinae, that shared the burden of striking gold, silver, and aes issues simultaneously. Blanks for dupondii were typically cast in prepared mould matrices before being adjusted to a target weight standard. While individual specimens vary due to standard ancient manufacturing tolerances, the median weight for dupondii during this era generally ranged between 10 and 13 grams, with flan diameters averaging between 24 and 27 millimeters. Production employed manual striking, where a heated blank was positioned between a lower anvil die, normally cut with the emperor's obverse portrait, and an upper punch die containing the reverse design. Die preparation in the late second century AD demonstrated exceptional technical skill, though stylistic execution loosened toward the end of Commodus's reign as workshop output fluctuated. The signature letters S C, signifying Senatus Consulto, remained a permanent fixture on the reverse fields of nearly all Commodan dupondii, formally preserving the ancient constitutional convention of senatorial authorization over the base-metal issues.

Obverse Portraiture and Attributes

The obverse of the dupondius was anchored by the portrait of Commodus, which underwent continuous iconographic evolution mirroring his transition from adolescence to absolute ruler. On the earliest issues produced between 175 and 177 AD, while holding the rank of Caesar, Commodus appears bare-headed with juvenile, clean-shaven features. Following his elevation to Augustus in 177 AD and especially after assuming sole power in 180 AD, his portrait adopted the radiate crown, the unambiguous denominational marker of the dupondius. The radiate crown, originally associated with the solar deity Sol, symbolized imperial majesty and facilitated immediate identification in commerce. Stylistically, the bust of Commodus moved from the slender, lightly bearded countenance of his late teens toward the heavy, deeply curled hair and prominent, mature beard typical of Antonine imperial sculpture. Portraits are typically depicted facing right, rendered either draped and cuirassed, draped only, or bare-shouldered. In the final years of his reign, between 191 and 192 AD, Commodus's obverse iconography took a radical ideological turn, presenting the emperor wearing the lion skin headdress of Hercules, an explicit numismatic assertion of his claimed identity as the reincarnated demi-god Hercules Romanus.

Reverse Iconography and Programmatic Imagery

Reverse types on the dupondii of Commodus provide an expansive record of imperial policy, religious devotion, and administrative posturing. Early issues struck jointly with Marcus Aurelius celebrated the Danubian campaigns, depicting military trophies, captives, and Victoria crowning the co-emperors. Subsequent types from the early 180s AD emphasized peaceful continuity, featuring personifications such as Pax burning spoils of war, Felicitas holding a caduceus, and Securitas seated in tranquil repose. The emperor's administrative munificence was repeatedly advertised through Liberalitas scenes, which depicted the distribution of cash gifts to the Roman populace. As political isolation and internal conspiracies marked his later years, the reverse repertory leaned heavily on protective divinities. Jupiter Conservator, Mars Pacifer, Apollo, and Serapis were frequently invoked. The dramatic culmination arrived in 191 and 192 AD with types directly celebrating the Commodian golden age and the refounding of Rome as Colonia Lucia Annia Commodiana. Iconic reverses of this final phase include the club of Hercules within a laurel wreath, the bow and quiver, and representations of Commodus driving a yoke of oxen to mark out the sacred pomerium of his renamed capital.

Inscriptions, Titulature, and Chronological Markers

Epigraphic evidence on Commodan dupondii is vital for establishing precise chronological sequences. Obverse legends invariably trace his accumulating imperial titles, beginning with L AVREL COMMODVS CAES in his youth. Upon his promotion to Augustus, the title IMP was prefixed, alongside AVGVSTVS and later the family name ANTONINVS. By 180 AD, his regular title incorporated M COMMODVS ANTONINVS AVG, which in 183 AD was augmented by the honorific PIVS, and in 185 AD by FELIX, producing the formula M COMMODVS ANT PIVS FELIX AVG BRIT after his celebrated campaign in Britannia. Reverse legends frequently carried the iterative counts of his tribunician power (TR P, TR P II through TR P XVII), his consulships (COS through COS VII), and imperial acclamations (IMP II through IMP VIII), alongside the foundational title Pater Patriae (P P). These numbered magistracies permit modern scholars to date specific emissions to exact calendar years. The letters S C almost universally occupied the reverse field or exergue. In 191 and 192 AD, the obverse legends were restructured to reflect his extreme titular pretensions, occasionally reading L AEL AVREL COMM AVG P FEL or dedicating types directly to HERC COMMODIANO.

Typological Development and Classification

Modern numismatic classification of Commodus's dupondii follows the chronological frameworks codified in standard corpora such as Roman Imperial Coins (RIC) Volume III and the British Museum Catalogue (BMCRE) Volume IV, refined further by Wolfgang Szaivert's die and mint analysis. The coinage divides into three distinct structural phases. The first phase spans 175 to 180 AD, consisting of youthful Caesar issues and joint Augustan issues alongside Marcus Aurelius, characterized by themes of dynastic harmony, pietas, and frontier pacification. The second phase, from 180 to 189 AD, covers his early sole reign, dominated by standard imperial virtues, the grain supply (Annona), military vigilance, and the formal assumption of the cognomina Pius and Felix. The third phase, from 190 to 192 AD, encompasses the extreme religious transformation of the regime. During this terminal period, dupondii mirrored the broader bronze and silver output by abandoning traditional modesty in favor of Hercules-centered typology, commemorating the re-establishment of Rome, and utilizing abbreviated, unorthodox titulature. Typological survival varies considerably across these phases; while peace and victory types from the mid-180s AD are abundantly documented, late Herculean bronze fractions, including dupondii, were struck in smaller batches shortly before the emperor's death.

Circulation, Hoards, and Archaeological Context

Commodan dupondii circulated broadly throughout the western provinces of the Roman Empire, including Italy, Gaul, the Rhine frontier, and Britain, while base-metal circulation in the eastern Mediterranean was dominated by local provincial coinages. Archaeological findspots and excavation strata demonstrate that dupondii experienced sustained, long-term circulation. Because base-metal denominations were not subject to state demonetization or aggressive culling in the manner of precious metal coins during debasements, second-century dupondii frequently remained in civilian use well into the third century AD. Excavation contexts from Roman military forts and civilian vici along Hadrian's Wall and the Limes Germanicus show high degrees of mechanical wear on Commodan dupondii, indicating decades of daily handling. In hoard contexts, dupondii are frequently recovered within large mixed aes deposits alongside earlier Flavian, Trajanic, and Antonine issues. Following the assassination of Commodus on December 31, 192 AD, the Roman Senate enacted a formal damnatio memoriae, pulling down his statues and erasing his name from public stone inscriptions; however, this sanction was not systematically extended to his circulating base-metal coinage, enabling thousands of his dupondii to remain in active monetary circulation until the mid-third-century crisis.

References

1. Coins of the Roman Empire in the British Museum, Vol. IV: Antoninus Pius to Commodus. pp. 688-860
2. The Roman Imperial Coinage, Vol. III: Antoninus Pius to Commodus. pp. 356-443
3. Die Münzprägung des Kaisers Commodus (MIR 18). monograph