Trajan Orichalcum Dupondius, RIC II Trajan 464

Monetary Context and Denominational System

The monetary system of the early second century AD operated upon the bimetallic and base-metal foundations established by Augustus and refined by the Flavian dynasty. Within this hierarchy, the dupondius occupied a critical middle position among the everyday base-metal denominations. Valued at two copper asses, half an orichalcum sestertius, or one-eighth of a silver denarius, the dupondius fulfilled the routine transactional requirements of urban commerce, military accounting, and municipal markets. While the larger sestertius served as both an accounting unit and the premier display canvas for imperial monumental propaganda, the dupondius ensured that similar public messaging penetrated the everyday transactions of ordinary Roman citizens and provincial subjects. Technically, the dupondius was differentiated from the similarly sized as through both metal composition and portrait iconography. Beginning under Augustus, dupondii and sestertii were cast and struck in orichalcum, a golden-toned alloy of copper and zinc, whereas the as was struck in unalloyed, reddish copper. Because wear, patination, and corrosion in circulation could obscure subtle color differences between orichalcum and copper, the radiate crown had been introduced under Nero as an indelible diagnostic marker of the double denomination. On RIC II Trajan 464, Trajan wears this radiate crown, ensuring that handlers could immediately identify the coin as a dupondius without relying purely on weight or metallic luster. By the reign of Trajan, imperial mint authorities exercised rigorous control over base-metal token denominations, whose intrinsic metal value remained lower than their official face value. The production of orichalcum required specialized metallurgical processing, including the cementation process where zinc ore (calamine) was combined with molten copper. Although the zinc content in Roman orichalcum gradually declined from the Augustan period through the second century AD due to the recycling of scrap brass, Trajanic dupondii maintained consistent production standards, enabling them to circulate reliably alongside earlier Flavian and Neronian bronze across the empire.

Production Standards and Minting at Rome

RIC II Trajan 464 was manufactured exclusively at the imperial mint of Rome, the sole facility authorized to produce base-metal senatorial coinage for western circulation during this period. The mint was organized into specialized workshops, or officinae, which operated under the administrative oversight of the equestrian procurator monetae. Skilled celators carved pairs of hardened iron dies, while furnace workers prepared and cast flans to prescribed weight tolerances. Under Trajan, the theoretical standard for the orichalcum dupondius was approximately 11 to 14 grams, with diameters commonly falling between 26 and 28 millimeters. However, individual specimens exhibit minor variations in flan thickness, weight, and strike centering, reflecting the practical realities of high-volume manual coin production. Flans were cast in open or two-part molds before being heated and struck between an obverse anvil die and a reverse punch die. Die alignment on mid-imperial base-metal issues was predominantly adjusted to an upright or inverted axial orientation (roughly 6 o'clock or 12 o'clock). The metallurgical recipe used for RIC II Trajan 464 comprised copper alloyed with zinc, occasionally containing small incidental percentages of tin and lead derived from recycled metallic feedstock. Because orichalcum was harder and more brittle than pure copper, striking required substantial kinetic force from the hammer men, occasionally producing peripheral stress fractures along the coin edges. The dies themselves were engraved with meticulous detail, capturing both the naturalistic modeling of the imperial portrait and the intricate architectural components of the reverse grotto.

Obverse Iconography and Imperial Portraiture

The obverse of RIC II Trajan 464 features the mature head of Trajan facing right, crowned with the radiate solar crown that denotes the dupondius denomination. Trajan's numismatic portraiture during his fifth consulship marks a distinct evolution away from the earlier veristic, Flavian-influenced styles toward an idealized, monumental imperial image. The portrait displays Trajan's characteristic low forehead, straight combed hair cropped across the brow, a prominent nose, and a firm, set jawline, conveying gravitas, military discipline, and serene administrative authority. The radiate crown, traditionally linked to Helios and Sol, had lost any strictly divinizing or hubristic connotation by the early second century AD, functioning within the monetary sphere as an official indicator of denomination. Nevertheless, the solar imagery harmonized effectively with Trajan's public persona as the tireless protector and benefactor of the Roman world, bringing prosperity and civic renewal to the state. The bust truncation is typically cleanly executed at the base of the neck, occasionally showing traces of drapery on the far shoulder depending on the specific die variant, though the bare-neck form dominates this issue. The die engraving is crisp and proportional, with the circular inscription arranged neatly along the outer beaded border. The spatial composition demonstrates the advanced craftsmanship of the Rome mint celators, who balanced the high relief of the portrait head with the lengthy titling required by Trajan's accumulating honors.

Reverse Design and the Aqua Traiana Motif

The reverse of RIC II Trajan 464 presents an elaborate architectural and allegorical composition celebrating the Aqua Traiana, one of Rome's most ambitious hydraulic engineering projects. Inaugurated in AD 109, the aqueduct drew pure water from natural springs around Lacus Sabatinus (modern Lake Bracciano) and transported it over forty kilometers to supply the industrial and residential quarters of the Janiculum and Trastevere (Regio XIV Transtiberim), powering municipal grain mills and feeding public baths. The design depicts a river god, embodying the water source or the aqueduct itself, reclining toward the left within an arched, vaulted grotto or nymphaeum supported by two slender columns. The deity is depicted semi-nude, with his lower body draped in loose fabric. In his right hand, he holds a slender marsh reed, a traditional attribute of aquatic deities symbolizing fecundity and riparian environments. His left arm rests comfortably upon a tilted ceramic water urn, from which a continuous stream of water flows downward across a bed of naturalistic rocks beneath the architectural structure. This composition masterfully synthesizes classical personification with actual infrastructure. The vaulted grotto represents the monumental capture basins (caput aquae) and nymphaea constructed at the springs, transforming a utilitarian engineering work into an aesthetic and sacred civic monument. The letters S C, signifying Senatus Consulto, are placed conspicuously in the field or exergue, affirming that the Senate formally decreed the striking of the issue to honor the princeps for his munificence to the city of Rome.

Inscriptions and Epigraphic Analysis

The obverse legend on RIC II Trajan 464 reads continuously clockwise: IMP CAES NERVAE TRAIANO AVG GER DAC P M TR P COS V P P. Rendered in full Latin epigraphy, this expands to Imperatori Caesari Nervae Traiano Augusto Germanico Dacico, Pontifici Maximo, Tribunicia Potestate, Consuli Quintum, Patri Patriae. The legend uses the dative case (Traiano instead of Traianus), a distinctive feature introduced during Trajan's reign that emphasizes dedicating the coinage to the emperor as a gift from the Senate and people of Rome. The formula records his adoption by Nerva, his imperial and Augustan titles, his military triumph titles Germanicus (gained under Nerva) and Dacicus (awarded following his first Dacian War in AD 102), his position as chief priest (Pontifex Maximus), his annual civil authority (Tribunicia Potestas), his fifth consulship (COS V), and his title as Father of the Country (Pater Patriae). The reverse legend is arranged in two distinct elements. Arcing around the upper perimeter is the senatorial acclaim S P Q R OPTIMO PRINCIPI, expanding to Senatus Populusque Romanus Optimo Principi (The Senate and the Roman People to the Best of Princes). The epithet Optimus Princeps was formally bestowed upon Trajan by the Senate and became the defining ideological slogan of his reign. In the exergue below the rocky ground line, the specific commemorative title appears: AQVA TRAIANA. Accompanied by S C (Senatus Consulto) either flanking the type or adjacent to the exergual inscription, the legend explicitly names the aqueduct project, providing unmistakable identification of the celebrated civic benefit.

Typology and Chronological Placement

Within the standardized typology of Roman imperial numismatics, this issue is catalogued as RIC II Trajan 464 and is cross-referenced in Bernhard Woytek's Die Reichsprägung des Kaisers Traianus as MIR 14, type 363. The broader chronological window for Trajan's fifth consulship spans from AD 103, when he entered his consulship, until AD 111, the year preceding his sixth consulship (COS VI in AD 112). However, historical and epigraphic evidence permits a much narrower dating for RIC II Trajan 464. Inscriptional records, including the Fasti Ostienses, document that the Aqua Traiana was formally dedicated on June 24, AD 109, adjacent to the opening of the Baths of Trajan (Thermae Traiani) on the Oppian Hill. Consequently, numismatists including Harold Mattingly and Bernhard Woytek assign this commemorative issue specifically to the period between AD 109 and 111. The type was produced as part of a coordinated programmatic emission of aes coinage that included corresponding sestertii featuring similar infrastructural motifs, such as the harbor of Ostia (Portum Traiani) and the Danube bridge. Minor die varieties exist within RIC II Trajan 464, primarily involving subtle shifts in the placement of the letters S C, variations in the rendering of the columns and the vaulted arch, and slight adjustments in the spacing of the obverse titular elements. The fundamental iconographic layout, however, remains remarkably consistent across surviving dies, indicating a focused, tightly managed emission celebrating the completion of the aqueduct.

Circulation, Distribution, and Archaeological Context

As an official base-metal issue of the Rome mint, RIC II Trajan 464 circulated widely across the western provinces of the Roman Empire, where the supply of imperial bronze was concentrated. Archaeological finds from excavations in Italy, Gaul, the Rhineland, Britannia, and the Danubian frontier demonstrate that Trajanic dupondii entered general circulation rapidly and remained in commercial use for decades. In the western provinces, where local municipal minting had largely ceased by the mid-first century AD, Roman aes coinage served as the essential grease for monetization. Unlike gold and silver coinage, which was subject to periodic hoarding and official reminting, base-metal dupondii were intended for continuous physical expenditure. As a result, surviving specimens of RIC II Trajan 464 frequently exhibit moderate to heavy wear, indicating prolonged transactional service through the Antonine and Severan eras. The heavy circulation of orichalcum dupondii also made them susceptible to secondary loss in market contexts, military camps, and river crossings, where they regularly appear as single site-finds. The explicit civic message of the Aqua Traiana was primarily directed at the population of the capital, where the benefits of the fresh water supply were immediately tangible. Nonetheless, its dissemination throughout the provinces served as an effective reminder of the emperor's providential care and infrastructural power, projecting an image of benign imperial governance centered upon public welfare and urban enhancement.

References

1. Coins of the Roman Empire in the British Museum, Volume III: Nerva to Hadrian. pp. 182-183, nos. 876-879
2. Online Coins of the Roman Empire: RIC II Trajan 464. RIC II Trajan 464
3. The Roman Imperial Coinage, Volume II: Vespasian to Hadrian. p. 278, no. 464
4. Die Reichsprägung des Kaisers Traianus (Moneta Imperii Romani 14). Type 363, pp. 336-339