Hadrian Orichalcum Dupondius

Monetary Role and Denominational Context

Within the reformed monetary system originally organized by Augustus and maintained into the second century AD, the dupondius occupied a vital intermediate position among base-metal denominations. Valued at two asses, it was equivalent to one-half of a sestertius, one-eighth of a silver denarius, and one two-hundredth of a gold aureus. This intermediate valuation made the dupondius an essential instrument for everyday small-scale market transactions, service payments, and municipal market tolls where silver coinages were too valuable to offer practical change. Unlike the sestertius, which was also struck in orichalcum but commanded double the purchasing power, the dupondius shared a weight range that closely overlapped with that of the pure copper as. Consequently, Roman authorities relied on both metallurgical distinction and visual design to prevent confusion. The brass alloy provided an initially bright, golden sheen that set the dupondius apart from the darker red appearance of fresh copper asses. As circulation wear and surface patination dulled the alloy contrast over time, the visual diagnostic of the radiate crown worn by the emperor served as an indelible signifier of the double-as valuation. During Hadrian's principate, fiscal policy demanded a massive volume of fractional currency to support urban populations, public works, and legionary camps, cementing the dupondius as an ubiquitous feature of everyday commerce.

Production Technology, Metallurgy, and Mints

The overwhelming majority of imperial dupondii for Hadrian were produced by the central mint of Rome. Operating under the administrative oversight of the rationalis and equestrian procurators, the Rome mint employed skilled die-cutters, flan-casters, and striking teams organized into distinct operational workshops known as officinae. Flans were produced by casting molten metal into multi-cavity open or bivalve molds, yielding blanks that frequently retained slight bevels or minor casting tang remnants prior to cold-striking between hardened bronze or iron dies. The primary metallic constituent of the dupondius was orichalcum, a brass alloy of copper and zinc. Metallurgical analyses of second-century coinage demonstrate that the zinc content of Roman brass had declined moderately since its peak under Augustus and Nero. Whereas early imperial brass often contained between fifteen and twenty percent zinc, Hadrianic issues frequently range between eight and fourteen percent. This shift reflected an increasing reliance on recycled brass scrap combined with freshly smelted cementation brass, as calamine ore deposits became more intensively exploited. While small supplementary emissions of aes coinage were occasionally struck at Antioch or other provincial hubs to satisfy regional shortages in the East, the standard Latin-inscribed dupondii found throughout the western empire derived almost exclusively from the Rome mint.

Obverse Iconography and Imperial Portraiture

The obverse of the Hadrianic dupondius is defined by the radiate crown (corona radiata), which serves as the formal denomination mark distinguishing the coin from the laureate sestertius and as. Hadrian is portrayed with distinctive physical realism and classicizing dignity, most notably showcasing his neatly trimmed beard and curling hair in the Greek philosophical manner, a dramatic departure from the clean-shaven tradition of his imperial predecessors. Die-engravers rendered his portrait facing right in the vast majority of dies, though left-facing portraits appear across several issues. The imperial bust exhibits considerable stylistic evolution and sartorial variation across the reign. Early portraits often present a leaner, more angular facial structure reminiscent of Trajanic portraiture, frequently accompanied by bare shoulders or a simple draped mantle on the left shoulder. In the middle and later years of the reign, the portraiture becomes fuller and more idealized, exhibiting sophisticated treatments of the bust: bare-chested with light drapery, fully draped, or wearing a decorative cuirass adorned with a gorgoneion or paludamentum. The radiate crown itself is meticulously rendered, typically featuring five to seven prominent rays rising above the diadem band, emphasizing the emperor's cosmic role and association with Sol.

Reverse Types and Visual Programs

The reverse imagery of Hadrian's dupondii is remarkably diverse, reflecting the administrative, philosophical, and diplomatic priorities of his reign. The letters S C (Senatus Consulto) appear almost universally on the reverse field or exergue, signifying that the base-metal issue was struck under traditional senatorial authorization. Religious and civic personifications dominate the central decades of the reign, including Pietas, Salus feeding a serpent, Felicitas holding a caduceus and cornucopia, Hilaritas flanked by small children, Annona supervising the grain supply with a modius, and Aequitas holding scales. Major deities such as Roma seated or standing, Minerva, Jupiter Victor, and Diana also appear regularly. In the 130s AD, the dupondius participated fully in Hadrian's famous travel series. These issues celebrated the emperor's extensive inspections of the provinces through three thematic sub-types: the Adventus series depicting the emperor welcomed by provincial personifications; the Restitutor series showing Hadrian raising a kneeling province; and the Exercitus series honoring the provincial legions and auxilary troops, such as those of Britannia, Hispania, Gallia, Cappadocia, and Mauretania. Allegories of geography, including personifications of the Nile, Tiber, and regional cities, were also engraved on dupondius dies, transforming everyday coinage into a comprehensive visual atlas of the Roman world.

Epigraphy and Legend Variations

The inscriptions on Hadrianic dupondii reflect shifts in official nomenclature and the systematic development of the emperor's imperial titulature. In the early period from AD 117 to 119, legends are expansive and emphasize adoption and dynastic succession: IMP CAESAR TRAIANVS HADRIANVS AVG on the obverse, accompanied on the reverse by pontifical, tribunician, and consular titles such as PONT MAX TR POT COS or P M TR P COS II, terminating with the senatorial formula S C. Following his assumption of his third consulship in AD 119, the title COS III became a permanent fixture of his coin legends. Around AD 124 to 125, Hadrian simplified the obverse legend to the concise form HADRIANVS AVGVSTVS, moving administrative formulas entirely to the reverse or dropping them in favor of evocative thematic epithets. A major change occurred in AD 128, when Hadrian officially accepted the title Pater Patriae. Subsequent coin series usually read HADRIANVS AVG COS III P P on the obverse, while the reverse was freed to feature explicit captions for personifications, imperial virtues, or travel events, such as ANNONA AVG, FELICITATI AVG, ADVENTVI AVG GALLIAE, or RESTITVTORI HISPANIAE. The lettering is uniformly executed in clear, elegant Classical Roman capitals, with standardized abbreviations understood throughout the empire.

Typology, Phasing, and Chronological Sequences

Modern numismatic scholarship divides Hadrian's dupondii into three broad chronological phases based on titulature, portrait style, and reverse themes. Phase One (AD 117-119) covers the accession and consolidation of power, characterized by complex Trajanic titulature, early military distributions, and reverse types emphasizing adoption, senatorial concord, and the initial consulships. Phase Two (AD 119-128) encompasses the adoption of the third consulship (COS III), the transition to the simplified HADRIANVS AVGVSTVS obverse legend around AD 124, and reverses highlighting peace, public happiness, and civic welfare following the conclusion of initial administrative tours. Phase Three (AD 128-138) begins with the acceptance of the Pater Patriae title (P P) and extends until the emperor's death. This final decade witnessed the striking of the magnificent provincial travel series, celebrating imperial visits and infrastructure restoration across the empire, as well as the adoption issues honoring Lucius Aelius Caesar and later Antoninus Pius as designated successors. Precise sequencing within these phases is established through die linkages, progressive changes in portraiture, and correlating reverse themes with historical milestones recorded in epigraphic and literary sources.

Circulation Patterns, Wear, and Hoard Evidence

As an everyday transaction medium, the dupondius circulated extensively throughout Italy and the western provinces, including Gaul, Britain, the Rhine frontier, and the Iberian peninsula. Unlike silver and gold coins, which were frequently hoarded for wealth preservation and hidden during times of military crisis, base-metal dupondii were utility coins that remained in active circulation for decades. Archaeological excavations of Roman military camps, urban fora, bathhouses, and river crossings routinely yield heavily worn specimens of Hadrianic dupondii, indicating prolonged circulation alongside earlier Flavian, Trajanic, and later Antonine brass. While base-metal hoards containing dupondii do occur, they typically represent commercial cash-boxes or temple votive deposits rather than aristocratic savings. In the Greek-speaking eastern provinces, Hadrian's Rome-minted dupondii circulated to a lesser degree due to the thriving local production of civic bronze coinage, although western legionary detachments stationed in the East regularly used and deposited imperial aes. Over generations of handling, the softer orichalcum alloy was subject to mechanical abrasion, leaving many surviving specimens with smoothed hair, worn radiate crowns, and obscured legend details, testifying to their critical functional role in the monetary economy.

References

1. Coins of the Roman Empire in the British Museum, Vol. III: Nerva to Hadrian. pp. 410-530
2. Orichalcum and Related Ancient Alloys (Numismatic Notes and Monographs 151). pp. 60-115
3. The Roman Imperial Coinage, Vol. II: Vespasian to Hadrian. pp. 400-485
4. Untersuchungen zur romischen Reichspragung des zweiten Jahrhunderts, Teil II: Die Reichspragung zur Zeit des Hadrian. pp. 1-240