RIC III Marcus Aurelius 864 Copper-Alloy Dupondius

Monetary Context and Denominational System

During the mid-second century AD, the Roman imperial monetary system operated on a bimetallic and base-metal hierarchy refined under Augustus and maintained through the Antonine dynasty. Within the aes denominations, the dupondius functioned as a two-as piece, valued at half a sestertius and one-eighth of a silver denarius. The Antonine monetary economy depended heavily on a high-volume supply of base-metal fractions to facilitate daily urban transactions, state retail activity, and soldiers' auxiliary expenditures. Unlike the copper as, the dupondius was traditionally struck in orichalcum, a golden-toned copper alloy containing zinc. However, because progressive alloy fluctuations and surface oxidation could render the visual difference between worn orichalcum and pure copper subtle in daily trade, the radiate crown functioned as a decisive denominational indicator. Marcus Aurelius continued the standard established under the early empire, employing the radiate crown on dupondii to ensure immediate recognition across the marketplace, contrasting with the laureate or bare-headed portraits typical of the as.

Production and Mint Organization

The entire production of standard imperial base-metal coinage under Marcus Aurelius was concentrated at the central imperial mint in Rome. Mint organization during this period was highly structured, divided into operational workshops (officinae) responsible for striking specific denominations and reverse types for Marcus Aurelius, co-emperor Lucius Verus, and Faustina II. Coin blanks were cast in individual molds or prepared as cast flan strips before being hand-struck between paired dies. Striking of base-metal issues adhered to broad theoretical weight standards rather than strict al-marco individual limits; mid-second-century dupondii generally centered around 11 to 14 grams, with flan diameters ranging from 24 to 27 millimeters. The chemical composition of the alloy was nominally orichalcum, though zinc concentrations varied significantly during the Antonine period due to the remelting of older brass flans and shifting supplies of calamine ore. Production of RIC III 864 fell into a specialized emission commemorating eastern operational milestones, managed by imperial monetary authorities working in concert with the Senate.

Obverse Iconography

The obverse of RIC III Marcus Aurelius 864 presents a mature right-facing bust of Marcus Aurelius shown with a cropped beard and curly hair, rendered in the classicizing high Antonine style. The head is adorned with the radiate crown (corona radiata), featuring prominent triangular rays extending outward from a circular headband. This solar attribute, originally connected with Apollo and Sol, served here primarily as a denominational mark designating the piece as a dupondius. The modeling of the imperial features reflects the solemn, philosophical public image cultivated by Marcus Aurelius, combined with standard conventions of imperial vigor. The die engraving exhibits the careful balance of text and portraiture characteristic of the Rome mint during the mid-160s AD, with the imperial bust centered neatly within an enclosing beaded border.

Reverse Iconography and Design

The reverse design represents Mars, the ancestral Roman god of war and protector of Roman arms, standing in full military attire. Facing right, the deity wears a crested helmet and a cuirass with pteruges. In his right hand, Mars holds a vertical spear with the point oriented upward, while his left hand rests firmly on the upper rim of an oval or round shield set upright on the ground. This static yet vigilant posture presents Mars as a guardian and guarantor of martial success rather than an advancing aggressor (Mars Gradivus). The figure is flanked in the lower field by the letters S and C, denoting Senatus Consulto. The design conveyed imperial martial vigilance at a time when Roman legions were actively engaged in the East to reclaim the client kingdom of Armenia and counter the Parthian empire.

Epigraphy and Imperial Titulature

The obverse inscription reads M AVREL ANTONINVS AVG ARMENIACVS P M, expanding as Marcus Aurelius Antoninus Augustus Armeniacus, Pontifex Maximus. The prominent inclusion of ARMENIACVS records the victory title assumed by Lucius Verus in late AD 163 and formally accepted by Marcus Aurelius shortly thereafter following the successful capture of Artaxata by Statius Priscus. Pontifex Maximus identifies Marcus as the supreme pontiff of the Roman state religion. The reverse legend carries the administrative formula TR P XVIII IMP II COS III, reading Tribunicia Potestate octavum decimum, Imperator secundum, Consul tertium, flanked by S C across the lower fields. This formula documents the eighteenth renewal of Marcus's tribunician power, his second imperial acclamation following the Armenian victories, his third consulship (held in AD 161), and the formal senatorial decree authorizing the base-metal issue.

Typology and Chronological Classification

In the standard classification of Roman imperial coins, this issue is catalogued as RIC III Marcus Aurelius 864. Its chronological placement is fixed with high precision by the combination of Marcus Aurelius's eighteenth tribunician power (TR P XVIII) and his second imperial acclamation (IMP II). Marcus's tribunician renewals occurred annually in December; TR P XVIII commenced on 10 December 163 and concluded on 9 December 164. The second imperial acclamation was awarded in late 163 in recognition of Roman arms in Armenia, and the title Armeniacus was taken up by Marcus early in 164. Consequently, numismatists date the issue securely to AD 163-164. RIC III 864 belongs to a coordinated series of copper-alloy and precious-metal issues featuring Mars and victory motifs produced across parallel denominations, including sestertii and denarii, to publicize Roman military ascendancy in the eastern provinces.

Circulation Patterns and Monetary Velocity

Dupondii struck at Rome under Marcus Aurelius circulated extensively across the Western provinces, the Italian peninsula, and the Danubian frontiers. Unlike regional bronze issues struck by civic authorities in the Greek East, imperial dupondii and sestertii served as standard medium-value currency throughout Gaul, Britain, Germany, and Spain. Archaeological hoard evidence and site finds demonstrate that second-century bronze coins remained in active circulation for decades, frequently passing through commerce well into the third century until the inflationary crises of the Severan and post-Severan periods. Because base-metal denominations were handled constantly in day-to-day retail exchange, surviving examples of RIC III 864 frequently exhibit moderate to extensive wear, with the distinctive radiate crown often serving as the primary visible feature distinguishing worn dupondii from asses in mixed currency deposits.

References

1. Coins of the Roman Empire in the British Museum, Vol. IV: Antoninus Pius to Commodus. pp. 570-575
2. Online Coins of the Roman Empire: RIC III Marcus Aurelius 864. ric.3.m_aur.864
3. The Roman Imperial Coinage, Vol. III: Antoninus Pius to Commodus. p. 288, no. 864
4. Die Münzprägung der Kaiser Marcus Aurelius, Lucius Verus und Commodus (161-192), Moneta Imperii Romani 18. nos. 68-72