Antoninus Pius Bronze Sestertius, RIC III Antoninus Pius 945

Monetary and Economic Context

During the reign of Antoninus Pius (AD 138 to 161), the Roman imperial monetary system maintained an unprecedented degree of administrative stability and public confidence. The sestertius, valued at four asses or one quarter of a silver denarius, was the preeminent large-denomination base metal coin of the empire. Valued above the dupondius, as, and semis, the sestertius was produced in orichalcum, a copper-zinc brass alloy that imparted a golden hue to freshly minted pieces. This aesthetic quality, combined with a broad flan of typically 30 to 34 millimeters in diameter, made the denomination the primary vehicle for visual state communications intended for broad civic circulation. Unlike the silver denarius and gold aureus, which fulfilled tax, trade, and military remittance needs, the sestertius operated heavily within the civil urban economies of Italy and the Romanized provinces. Type RIC III Antoninus Pius 945 appeared in the late Antonine golden age, a period marked by minimal external conflict and rigorous fiscal management, allowing the Rome mint to sustain high artistic standards and uniform production across the base-metal denominations.

Production Technology and Mint Organization

The entire emission of RIC III Antoninus Pius 945 originated at the centralized imperial mint in Rome. Operatives within the mint prepared cast orichalcum blanks, which were shaped and brought to standard target weights averaging between 22 and 27 grams, though individual surviving pieces exhibit typical variations due to manual flan preparation. Metallurgical analyses of contemporary Antonine orichalcum reveal a declining zinc concentration relative to the early Julio-Claudian golden brass, often incorporating modest levels of lead and tin to ease metal flow during striking. Engravers prepared paired iron dies with intricate, high-relief portraiture on the lower anvil die and the reverse allegorical figures on the upper punch die. Production was monitored under the constitutional fiction of senatorial oversight for base-metal coinage, expressed by the prominent letters S C (Senatus Consulto) on the reverse field. The alignment of dies in this period was consistently oriented close to the vertical twelve o'clock or six o'clock axes, reflecting the systematic operational discipline maintained by the Rome mint officinae.

Obverse Portraiture and Style

The obverse of RIC III Antoninus Pius 945 presents a mature, dignified portrait of Antoninus Pius facing right. The emperor is depicted wearing a laurel wreath tied at the occiput with two ribbons (taeniae) falling behind his neck. The portrait reflects the idealized realism characteristic of mid-second-century Roman court art, presenting Antoninus with a thick, neatly arranged coiffure of curled hair, a broad forehead, and a full, carefully trimmed beard that evokes Greek philosophical traditions adopted by the Antonines. In standard typology, the bust is described as laureate head right, though documented die varieties also include drapery resting on the left shoulder, creating minor iconographic subtypes within the unified catalog entry. The carving conveys gravity (gravitas) and moderation (temperantia), visually expressing the ruler's traditional Roman virtues without military ostentation.

Reverse Iconography and Composition

The reverse design of this sestertius portrays Pax, the personification of peace, standing upright facing left. Draped in a long, classical stola with mantle folds gathering across her hips, she holds an olive branch in her extended right hand, lowered toward the ground. In her left arm, she cradles an overflowing cornucopiae, the horn of abundance filled with fruits of the earth. The olive branch, angled downwards rather than brandished defensively, signifies peace as a realized condition rather than a negotiated truce, while the cornucopiae illustrates the direct material consequence of peace: economic abundance and security. Flanking Pax across the central field are the letters S and C, denoting Senatus Consulto. The composition represents one of the signature allegorical themes of Antoninus Pius, celebrating the enduring internal concord and absence of aggressive territorial expansion that characterized his two decades in power.

Inscriptions and Epigraphic Analysis

The obverse inscription reads ANTONINVS AVG PIVS P P IMP II, lettered clockwise along the rim. Expanded, this reads Antoninus Augustus Pius, Pater Patriae, Imperator II. The title Imperator II recalls his single accepted military acclamation following the campaigns of Quintus Lollius Urbicus in Britannia in the early 140s AD, retained consistently throughout his subsequent titles. The reverse legend is rendered as TR POT XIX COS IIII around the periphery, completed by S C in the lower fields. This expands to Tribunicia Potestate XIX, Consul IV, along with Senatus Consulto. The epigraphy is clear and balanced, executed with square serifs and standardized imperial letterforms. The inscription deliberately connects the institutional constitutional offices of the princeps with the blessings of the Roman state, grounding the Pax reverse in the legal authority bestowed by the Roman Senate and people.

Typology and Chronological Placement

The chronological window for RIC III Antoninus Pius 945 is securely anchored by the record of the emperor's nineteenth tribunician renewal (TR POT XIX). Because Antoninus Pius renewed his tribunician power annually in December, TR POT XIX ran from December AD 155 to December AD 156. The designation Consul IV records his fourth consulship, assumed in AD 145, which was his final ordinary consulship. Harold Mattingly and Edward Sydenham cataloged this issue under number 945 in Roman Imperial Coinage, Volume III, placing it among the regular bronze outputs of the mid-150s. Parallel issues bearing the Pax reverse were simultaneously struck in silver denarii and gold aurei, as well as on smaller bronze fractions like the dupondius and as, indicating a coordinated multi-denomination emission program at the Rome mint celebrating the continued peace of the empire during the nineteenth regnal year.

Circulation, Hoards, and Archaeological Evidence

Sestertii of Antoninus Pius, including RIC 945, enjoyed exceptionally long lifespans in circulation. Archaeological excavations and hoards from Britain, Gaul, the Rhine frontier, and Italy demonstrate that large bronze coins struck during the Antonine period remained in daily trade well into the third century AD. Due to their solid weight and intrinsic brass value, these coins circulated alongside the lighter, debased sestertii of the Severan dynasty and the Crisis of the Third Century, frequently showing advanced stages of surface wear, smoothing, and occasional countermarks. Findspots in civilian settlements and military frontier forts alike underline the nationwide distribution of the Rome mint's bronze products. By the late third century, during the reigns of Postumus and Aurelian, surviving Antonine sestertii were often surrendered for official remelting or clipped for secondary emergency issues, underscoring their durable presence within the Roman monetary ecosystem.

References

1. Coins of the Roman Empire in the British Museum, Vol. IV: Antoninus Pius to Commodus. pp. 327-328
2. Online Coins of the Roman Empire: RIC III Antoninus Pius 945. RIC III Antoninus Pius 945
3. The Roman Imperial Coinage, Vol. III: Antoninus Pius to Commodus. p. 144, no. 945
4. Die Muenzpraegung des Kaisers Antoninus Pius (Moneta Imperii Romani 18). MIR 18, type 1022