Antoninus Pius Dupondius, RIC III Antoninus Pius 858

Monetary Context and Denominational Role

During the mid-second century AD, the Roman currency system was anchored by the bimetallic imperial gold and silver coinage, supported by an extensive subsidiary network of copper-alloy denominations. Within this hierarchy, the dupondius held a tariffed value of two asses, making it equal to half a sestertius, one-eighth of a silver denarius, and one two-hundredth of a gold aureus. It served as a workhorse denomination for everyday commerce, enabling market transactions that were too modest for silver coinages yet required larger purchasing power than individual bronze asses. Under the monetary standards stabilized since the Augustan reforms and continued into the Antonine period, the dupondius was systematically manufactured from orichalcum, a golden-toned copper-zinc alloy known historically as brass. This metallurgical choice separated it from the as, which was struck in pure copper, giving the dupondius a distinct natural coloration upon release into circulation. Alongside its compositional character, the denomination was explicitly demarcated by the radiate solar crown worn by the emperor, a visual convention instituted under the early Julio-Claudians to eliminate confusion between similarly sized bronze and brass flans. Issued under Antoninus Pius in AD 148 to 149, RIC III 858 reflects the height of second-century monetary stability, an era marked by consistent production schedules, controlled inflation, and steady imperial output.

Mint Production and Metallurgical Standards

The entire regular base-metal coinage bearing the senatorial formula S C during the reign of Antoninus Pius was manufactured at the central imperial mint in Rome. Production of RIC III 858 utilized blank orichalcum flans prepared by casting rounded ingots or cutting segments from cast rods, which were then adjusted in weight prior to being struck between hardened bronze or iron dies. The theoretical weight standard for the dupondius during the mid-second century hovered around 12 to 14 grams, with diameters commonly falling between 26 and 28 millimeters, although normal striking variations across individual workbenches produced substantial flan deviations. To achieve high relief and durable impressions, blanks were heated to anneal the metal before striking. Mint artisans engraved obverse portrait dies with remarkable fidelity, capturing the mature facial features of Antoninus Pius with characteristic realism, trimmed beard, and neatly curled hair beneath the sharp spikes of the radiate crown. Reverse dies were prepared using a combination of hand engraving and standardized punch elements for lettering and allegorical attributes. Alignment of the dies at the Rome mint was customarily maintained on a vertical or slightly offset axis, typical of imperial Roman workshop discipline during the mid-Empire.

Obverse Iconography and Imperial Image

The obverse of RIC III 858 presents the right-facing head of Antoninus Pius wearing a radiate crown. Unlike the sestertii of the same emission, which display a laurel wreath, the radiate crown serves as the primary visual marker denoting the dupondius denomination. In Roman imperial iconology, the solar rays also carried subtle associations with Sol and the divine brilliance of legitimate imperial oversight. Antoninus Pius is rendered in his characteristic dignified portrait style: his profile exhibits a prominent nose, calm expression, and neatly cropped beard that adhered to the philosophical fashion popularized by his predecessor Hadrian. The portrait truncation sits neatly above the bottom lettering of the legend. Minor die variations exist in the degree of portrait modeling, the spacing of the individual rays, and the termination of the drapery truncation, reflecting the hands of multiple engravers working simultaneously within the officinae of the Rome mint. The entire obverse composition is bordered by a continuous ring of fine dots, framing the imperial image within a crisp circular boundary.

Reverse Iconography of Aequitas

The reverse of the coin is devoted to Aequitas, the personification of equity, fair distribution, and commercial justice. She is depicted standing draped in a stola and palla, facing left. In her outstretched right hand, Aequitas balances a set of scales, an attribute symbolizing exactitude, equitable measurement, and honest weights. In her left arm, she cradles a cornucopia overflowing with fruits and produce, signifying the material abundance and commercial prosperity that flow from lawful and orderly administration. Flanking her lower figure are the large capital letters S and C, set across the field to signify senatorial sanction. The inclusion of Aequitas in AD 148 to 149 reaffirmed the emperor's stewardship of state finances, grain distributions, and market regulation, communicating that imperial authority safeguarded fair commerce and legitimate measure for every subject of the realm. The combination of balance and horn of plenty formed an intuitive visual metaphor, assuring the public of economic stability and the integrity of the state currency.

Epigraphic Formulas and Analysis

The inscriptions on RIC III 858 follow standard Roman administrative conventions, providing unambiguous chronological and institutional data. The obverse legend reads ANTONINVS AVG PIVS P P TR P XII, beginning at the lower left and continuing clockwise around the flan. This text expands to Antoninus Augustus Pius, Pater Patriae, Tribunicia Potestate Duodecima. The titulature emphasizes his accession name, the honorary cognomen Pius conferred by the Senate, his status as Father of the Country, and his twelfth annual renewal of tribunician sacrosanctity. On the reverse, the abbreviated legend reads COS IIII, indicating that Antoninus Pius had entered his fourth consulship, which he originally assumed in AD 145 and held for the remainder of his life without renewing the office. Flanking the standing figure of Aequitas are the letters S and C, expanding to Senatus Consulto, acknowledging the constitutional tradition that Roman base-metal coinage was issued under the formal decree of the Senate. The lettering is rendered in neat, serifed Latin capitals, executed with regular letter heights, though minor variations in ligature or spacing occur across distinct die pairs.

Typology and Chronological Classification

Within the typology established by Harold Mattingly and Edward A. Sydenham in Roman Imperial Coinage, type 858 is placed squarely in the mid-reign sequence of Antoninus Pius. Chronological precision is provided by the combination of TR P XII on the obverse and COS IIII on the reverse. Antoninus Pius renewed his tribunician power on the tenth of December each year; thus, his twelfth tribunician year commenced in December of AD 148 and concluded in December of AD 149. This tightly bounds the striking period of RIC III 858 to that twelve-month interval. While Aequitas standing left with scales and cornucopia is a recurrent reverse type across multiple denominations and years in the Antonine series, type 858 is catalogued specifically as the radiate dupondius paired with this exact obverse legend. Neighboring entries in the catalogue record the parallel sestertius carrying a laurel wreath and fuller consular titling, as well as the contemporary as, which carries a laureate or bare-headed portrait. RIC III 858 represents the radiate brass counterpart within this coordinated denominational program.

Circulation Patterns and Monetary Survival

Upon entering circulation, dupondii of Antoninus Pius circulated extensively throughout Italy and the western provinces of the Roman Empire, including Gaul, Britannia, the Germanies, and Hispania. As brass orichalcum pieces were actively used in commercial exchanges, they suffered continuous surface wear, and over prolonged circulation the zinc content patinated or leached out, causing older dupondii to blend visually with red copper asses. Excavation evidence demonstrates that mid-second century base-metal coins experienced prolonged lifespans, remaining in active circulation for several decades, often into the Severan era or the mid-third century until the debasements of the antoninianus system altered fractional coin use. Surviving examples of RIC III 858 frequently exhibit moderate to heavy wear, reflecting decades of marketplace handling. Because base-metal denominations were seldom hoarded with the same exclusivity as gold aurei or silver denarii, specimens surviving in high grades are relatively scarce compared to well-worn finds from urban sites and military vici.

References

1. Coins of the Roman Empire in the British Museum, Volume IV: Antoninus Pius to Commodus. Antoninus Pius, Dupondius and As issues of TR P XII
2. Online Coins of the Roman Empire: RIC III Antoninus Pius 858. ric.3.ant.858
3. The Roman Imperial Coinage, Volume III: Antoninus Pius to Commodus. p. 135, no. 858
4. Untersuchungen zur romischen Reichspragung des zweiten Jahrhunderts, Teil II: Die Reichspragung zur Zeit des Antoninus Pius. Typen Antoninus Pius, AD 148-149