Antoninus Pius Bronze Sestertius, RIC III Antoninus Pius 616a

Monetary Context and Denominational Function

The sestertius occupied a central structural position within the reformed monetary framework established by Augustus and maintained through the Antonine era. Valued at four asses, two dupondii, or one-quarter of an imperial denarius, the denomination served as an indispensable intermediary between the smaller daily bronze coinage and the higher-value silver and gold denominations. Under Antoninus Pius, the imperial treasury maintained the compositional distinction between the yellowish orichalcum alloy reserved for sestertii and dupondii and the purer copper designated for asses and quadrantes. The broad flan and heavy mass of the sestertius made it the most visually impactful coin in routine domestic commerce. It offered sufficient physical surface area to display detailed imperial portraiture and allegorical compositions that resonated with senatorial elites, merchant networks, and ordinary provincial citizens alike. In fiscal accounting, the sestertius also functioned as the traditional Roman money of account (sestertius nummus), bridging state accounting terminology with physical specie circulating in markets, military camps, and provincial administrative centers.

Production Standards and Mint Operation

Production of RIC III Antoninus Pius 616a was concentrated at the central imperial mint of Rome, which exercised an effective monopoly on regular base-metal striking for the western provinces during this epoch. Sestertii of the Antonine period were manufactured using carefully prepared orichalcum flans, an alloy predominantly composed of copper with a zinc content typically ranging between ten and twenty percent, though variable recycling practices could incorporate small proportions of tin or lead. Dies were manually engraved by skilled engravers in the urban workshops of Rome. While individual surviving specimens exhibit the natural mass variations inherent to ancient al marco weight adjustments, the median weight standard for sestertii during the mid-second century AD hovered around twenty-four to twenty-eight grams, with typical diameters ranging between thirty-one and thirty-four millimeters. Flans were cast in open or two-part molds and heated prior to striking between engraved iron dies, producing distinct bevels and occasional striking splits along the perimeter.

Obverse Iconography and Modeling

The obverse of RIC III Antoninus Pius 616a bears a refined, mature portrait of Antoninus Pius facing right, adorned with a laurel wreath tied at the occiput with two ribbon tails descending down the neck. The modeling of Antoninus Pius during this phase of his reign, spanning his third consulship, is characterized by restrained Antonine verism combined with dignified idealization. His hair is arranged in deep, layered curls over the brow and crown, and his beard is neatly trimmed in the Hellenizing fashion popularized under his predecessor Hadrian. The facial features exhibit a straight nose, almond-shaped eye, and composed expression, conveying tranquility, civic responsibility, and pietas. The truncation of the neck is plain, without drapery or cuirass in this primary variety, emphasizing the civil and senatorial demeanor that Antoninus cultivated throughout his administration.

Reverse Iconography and Symbolism

The reverse composition presents a classic personification of Pax, the goddess of peace, standing upright with her body turned slightly toward the left. She is clothed in long, flowing stola and palla that fall in soft folds to her feet, embodying decorum and civil harmony. In her extended right hand, Pax extends an olive branch upward or forward, a universal Greco-Roman emblem denoting the cessation of hostilities and peaceful reconciliation. In her left arm, she cradles a full cornucopiae, the horn of plenty bursting with fruits and grain, which directly connects the preservation of peace to material abundance and agrarian prosperity. In the field, positioned to the left and right of the figure, the letters S and C appear prominently. This senatorial formula reinforces the traditional authority of the Senate in the decreeing of base-metal coin types, underscoring the collaborative balance between the princeps and the senatorial order.

Epigraphy and Titulature

The legends on this type present standard, formal imperial Latin epigraphy, engraved in clear capital letters along the peripheral margins. The obverse legend reads ANTONINVS AVG PIVS P P TR P COS III, beginning at the lower left and running clockwise around the portrait. This formula encapsulates the emperor's official public titles: Antoninus, Augustus, Pius (a cognomen bestowed by the Senate upon his accession), Pater Patriae (Father of the Fatherland), holder of the Tribunicia Potestas, and Consul for the third time. The reverse legend is succinct, reading PAX AVG, an abbreviation for Pax Augusti, or the Peace of the Emperor. Flanking the standing deity is the formula S C (Senatus Consulto), signifying that the bronze issue was struck by decree of the Senate. The epigraphic layout is well-balanced, though individual dies display slight spacing shifts or minor letter adjustments, reflecting individual die-sinker handiwork at the Rome mint.

Typology and Chronological Classification

In the standard classification scheme of The Roman Imperial Coinage, type 616a is assigned to the prolonged third-consular phase of Antoninus Pius, dating from his entry into the consulship in AD 140 until his fourth consulship in AD 145. Because the obverse titulature cites TR P without an iterative annual number alongside COS III, numismatists narrow the likely issue window of RIC 616a to circa AD 140 through 144. RIC 616 encompasses several closely related sub-types based on bust treatments and reverse variations; variety 616a specifically designates the laureate head facing right without drapery on the bust, paired with Pax holding an olive branch and cornucopiae. It must be carefully distinguished from contemporaneous sestertii where Pax holds a transverse sceptre, sets fire to a pile of arms, or appears seated, as well as from similar issues bearing TR P COS IIII struck after January AD 145.

Circulation, Findspots, and Monetary Longevity

As a major denominational issue of the Antonine principate, sestertii of the Pax Augusti type circulated extensively across the Roman Empire. Archaeological evidence from hoard contexts and stratified site finds indicates that Antonine orichalcum sestertii travelled freely from the urban center of Rome to military installations along the Rhine and Danube frontiers, as well as throughout the western provinces of Gaul, Britain, and Hispania. The high metallic value and heavy module of the sestertius meant that coins like RIC 616a remained in active circulation for many decades. Numerous specimens recovered from third-century deposits show significant surface wear, countermarking, or corrosion, demonstrating that these coins frequently circulated well past the Severan period until the catastrophic inflation of the mid-third century rendered large-module orichalcum coinage economically obsolete.

References

1. Coins of the Roman Empire in the British Museum, Volume IV: Antoninus Pius to Commodus. pp. 195-197
2. Online Coins of the Roman Empire: RIC III Antoninus Pius 616a. ric.3.ant.616a
3. The Roman Imperial Coinage, Volume III: Antoninus Pius to Commodus. p. 109, no. 616a
4. Untersuchungen zur romischen Reichspragung des zweiten Jahrhunderts, Teil III: Die Reichspragung zur Zeit des Antoninus Pius. nos. 841-845