Commodus Orichalcum Sestertius

Monetary Context and Denominational Role

During the reign of Commodus, the sestertius occupied an indispensable position within the Roman Imperial monetary system established by Augustus. Rated at four asses, two dupondii, or one quarter of a silver denarius, the denomination was the primary large-denomination token coin of daily life. While the silver denarius and gold aureus formed the foundation for state-level transactions, military pay, and elite commerce, sestertii handled substantial domestic payments, regional market trade, and imperial handouts. The denomination continued to be manufactured from orichalcum, a copper-zinc alloy (brass) prized for its golden luster, substantial physical presence, and distinct visual hierarchy over copper asses. By the late second century AD, economic pressures, sustained military campaigns along the Danube, and the lingering economic effects of the Antonine Plague placed strain on the treasury. Although the precious-metal coinage experienced measurable reductions in fineness under Commodus, the bronze denominations largely maintained their traditional tariffing structure, circulating widely as state-backed token currency.

Mints, Metallurgy, and Production Standards

The overwhelming majority of regular imperial sestertii bearing the name and portrait of Commodus were struck at the central imperial mint in Rome. Provincial bronze strikings existed in the Greek East, but these followed local civic weight standards and Greek epigraphy rather than imperial sestertius norms. Production at Rome relied on heavily manned officinae responsible for melting, casting, striking, and quality control. Blanks were prepared by casting or cutting from cast rods and then heated to facilitate the impression of deep relief dies. The theoretical weight standard inherited from the high Antonine period centered near 24 to 26 grams, with diameters typically spanning 28 to 33 millimeters. Surviving specimens exhibit a considerable weight spread, ranging from under 20 grams to over 28 grams, indicating that blanks were adjusted al marco (by overall batch weight) rather than strictly al pezzo (by individual coin weight). Metallurgical analysis reveals that second-century orichalcum experienced a progressive decline in zinc content relative to early Julio-Claudian baselines. Recycled bronze, scrap copper, and lead were increasingly incorporated into melt batches, resulting in variable alloys often characterized numismatically as leathery or brassy copper alloy.

Obverse Portraiture and Typological Evolution

The obverse imagery of Commodus's sestertii documents his growth from an adolescent prince to an autocratic ruler identifying as a living god. Earliest portraits from 175 to 177 AD depict a youthful, bareheaded or laureate Caesar with soft facial features and short, curled hair reflecting his Antonine lineage. Upon his elevation to Augustus alongside Marcus Aurelius in 177 AD, his portrait adopted a more mature, laureate visage, occasionally displaying slight facial hair. Following his father's death in 180 AD, portraiture settled into an adult Antonine template characterized by thick, cascading curls, a prominent aquiline nose, and an increasingly voluminous beard. In the late 180s AD, the engraving style shifted toward pronounced stylization and heroic grandeur. The culmination of Commodus's obverse typological evolution arrived in 191 and 192 AD with the remarkable series depicting the emperor wearing the scalp and pelt of the Nemean lion, knotted under the chin. This bold iconographic departure presented Commodus not merely under the patronage of Hercules, but as Hercules Romanus incarnate, a visual formulation that scandalized contemporary senatorial observers such as Cassius Dio.

Reverse Iconography and Imperial Messaging

Because sestertii possessed broad flans, mint officials utilized reverse designs for elaborate public messaging, celebrating military victories, religious celebrations, civic largesse, and administrative reorganizations. Early issues celebrated Danubian triumphs with traditional motifs of Victoria erecting trophies, Mars advancing, and personifications of Pax, Felicitas, and Fides Exercituum. Liberalitas scenes appeared frequently, depicting the emperor seated on an elevated curule platform distributing cash gifts to citizens. In the middle reign, reverses turned toward themes of divine protection, invoking Iuppiter Conservator, Apollo Palatinus, Minerva, and Salus. Between 190 and 192 AD, the reverses recorded the emperor's dramatic ideological redefinition. Types depicted the emperor plowing the sulcus primigenius with an ox and cow to celebrate the refounding of Rome as Colonia Lucia Annia Commodiana. Other famous late types displayed the attributes of Hercules, specifically the club, bow, and quiver of arrows flanked by senatorial approval legends, cementing his claim to divine heroic authority.

Epigraphy and Titulature

Inscriptions on Commodus's sestertii provide precise dating evidence and track the incremental acquisition of imperial titles. Obverse legends as Caesar read COMMODO CAES AVG FIL GERM SARM, emphasizing his status as son of Augustus and victor over the Germans and Sarmatians. After his accession as sole Augustus, his standard obverse titles transitioned to M COMMODVS ANTONINVS AVG PIVS, later adding BRIT in 184 AD following campaigns in Britain, and FELIX in 185 AD. By 191 AD, his titulature reflected his full megalomaniacal re-naming: L AEL AVREL COMM AVG P FEL, incorporating the names of Lucius Aelius Aurelius. Reverse legends regularly recorded his tribunician power (TR P, progressing through TR P XVII), consulships (COS, concluding at COS VII), and the title Pater Patriae (P P). Almost all regular imperial sestertii bear the explicit senatorial authorization formula S C (Senatus Consulto) on the reverse, typically in the field or exergue, reflecting the traditional constitutional fiction of senatorial administration over bronze coinage. Even extreme late types, such as the club of Hercules with the legend HERCVL ROMANO AVGVSTO, retained the S C formula.

Typological Sequences and Chronological Phases

The sestertii of Commodus can be divided into four distinct numismatic phases. The first phase (175 to 177 AD) encompasses his issues as Caesar, focusing on juvenile portraits and themes of dynastic succession under Marcus Aurelius. The second phase (177 to 180 AD) represents the joint reign with his father, characterized by military themes of victory, barbarian subjection, and shared imperial virtues. The third phase (180 to 189 AD) covers his early and middle sole reign, dominated by traditional Antonine motifs, the celebration of the decennalia, vows for imperial safety (vota), and the inclusion of the cognomina Britannicus and Felix. The fourth phase (190 to 192 AD) comprises his late idiosyncratic issues. This final sequence witnessed the emergence of the Romanus Hercules coinage, the Amazonian titulature, and colonial re-foundation types. Following the assassination of Commodus on New Year's Eve in 192 AD, the Senate decreed a damnatio memoriae, prompting the immediate cessation of his sestertius production and the subsequent defacement or melting down of many late-issue portraits.

Circulation, Hoarding, and Archaeological Context

Commodus's sestertii circulated heavily throughout the western provinces of the Roman Empire, particularly in Italy, Gaul, the Rhineland, and Britain. In the eastern provinces, imperial sestertii occasionally penetrated local markets but rarely competed in volume with civic bronze coinages. Archaeological excavation finds and site stray losses demonstrate that sestertii remained active in circulation for decades after Commodus's death. Because brass was inherently valuable as raw metal, worn sestertii of the second century continued to exchange hands throughout the third-century inflationary crises, often countermarked or circulated until their surfaces were smoothed flat. In hoard contexts, Commodus's sestertii regularly appear alongside earlier Antonine, Hadrianic, and Trajanic bronzes, reflecting long periods of retention in domestic hoards. The damnatio memoriae declared after his death led to the physical scratching or mutilation of his portrait on some recovered specimens, though vast numbers continued to pass at face value in commercial exchange.

References

1. Coins of the Roman Empire in the British Museum, Volume IV: Antoninus Pius to Commodus. pp. 688-854
2. Coinage in the Roman Economy, 300 B.C. to A.D. 700. pp. 95-132
3. The Roman Imperial Coinage, Volume III: Antoninus Pius to Commodus. pp. 356-444
4. Die Munzpragung des Kaisers Commodus (MIR 18). Moneta Imperii Romani 18, Vienna