Probus Antoninianus RIC V Probus 706

Monetary Context and Reform Standards

The antoninianus designated under RIC V Probus 706 was struck within the reformed monetary framework established by Aurelian in AD 274 and maintained throughout the reign of Probus from AD 276 to 282. By the early 270s, the debasement of the double denarius had brought the silver content of the imperial antoninianus below two percent, precipitating widespread inflation and a severe loss of public confidence in state-issued currency. Aurelian's reform attempted to re-establish monetary discipline by introducing a standardized radiate coin, frequently termed the aurelianianus by modern numismatists, which possessed an alloy of twenty parts copper to one part silver, yielding a theoretical silver fineness of approximately five percent. This reformed standard was officially affirmed by value marks such as XXI in the western and Balkan mints or KA in Greek-speaking eastern branches, indicating twenty parts of base alloy to one part of pure silver. Under Probus, this weight and metallurgical standard remained the baseline for imperial billon coinages across the empire. Although individual specimens vary due to late third-century minting tolerances, these radiates targeted a nominal mass around 3.8 to 4.2 grams, with theoretical production standards hovering around eighty to eighty-four coins per Roman pound. The finished blanks received a superficial silver enrichment or pickling treatment prior to striking, coating the base alloy core with a fleeting white sheen that quickly wore away during active circulation. RIC V Probus 706 was integral to this system, serving as the workhorse denomination for state expenditures, taxation, and above all, military payroll along the vulnerable frontier provinces.

Production and the Siscia Mint

RIC V Probus 706 was minted exclusively at Siscia, modern Sisak in Croatia. Situated near the confluence of the Colapis (Kupa) and Savus (Sava) rivers, Siscia occupied an exceptional strategic position in the province of Pannonia Superior, functioning as an administrative, logistical, and transport hub linking northern Italy, the Illyrian interior, and the Danubian limes. The mint had been established during the joint reign of Gallienus and Saloninus in the early 260s to sustain the regional defensive lines against Sarmatian and Germanic incursions. Under Probus, Siscia expanded into one of the most prolific and technically sophisticated minting centers in the Roman Empire, operating multiple active workshops known as officinae. Production at Siscia during this period was characterized by careful die cutting, bold portrait modeling, and high organizational discipline. The mint utilized systemized workshop marks engraved in the exergue or lateral fields of the reverse die. Depending on the specific issue phase or emission cycle to which a die pair belonged, officina signatures might include Latin letters (P, S, T, Q, V, VI, or VII), Greek numerals (A, B, Γ, Δ, E, ς, or Z), or Roman numerical designations. These operational marks enabled mint magistrates to monitor production quotas and maintain quality control across millions of struck pieces. In conjunction with workshop identifiers, marks often incorporated the reform sign XXI or regional mint signatures such as SIS or SISC, underscoring Siscia's strict adherence to central imperial fiscal standards.

Obverse Iconography and Bust Varieties

The obverse of RIC V Probus 706 demonstrates the remarkable iconographic versatility that distinguishes the coinage of Probus from that of his immediate predecessors. Rather than confining the type to a single bust format, the Siscia mint executed this issue across four distinct bust varieties, as catalogued in the standard typological frameworks. All variants feature the radiate crown, the conventional numismatic signifier of the double-value radiate denomination since its inception under Caracalla. The most conventional variants portray the emperor facing right, depicted either draped and cuirassed, or simply wearing military cuirass. These standard right-facing profiles convey imperial dignity through formal military attire, presenting Probus as an orthodox commander and lawful magistrate. In contrast, the mint also cut left-facing bust dies of notable visual complexity. One prominent left-facing variant shows Probus in military cuirass, often adorned with ornamental details. A second, celebrated variant depicts the emperor facing left wearing a decorated helmet beneath the radiate crown, cuirassed, and equipped for combat with a spear held forward in the right hand and a shield braced over the left shoulder. This militant portraiture was a specialty of Siscia and other Illyrian mints during the reign. It served as deliberate ideological messaging aimed at the Danubian legions, portraying the emperor not as an aloof sovereign, but as a resolute soldier-emperor personally sharing the rigors and dangers of the frontier campaigns.

Reverse Iconography and Symbolism

The reverse of RIC V Probus 706 features Pax, the personification of peace, standing facing left in a relaxed, classical stance. Draped in long chiton and himation, she holds an olive branch aloft in her extended right hand and cradles a sceptre in her left. The sceptre is typically rendered either vertically or held transversely across her body, depending on die cutting preferences within individual workshops. The olive branch, a long-standing Mediterranean emblem of reconciliation and cessation of hostilities, signifies the restoration of civil harmony and external stability. Within the volatile geopolitical landscape of the late 270s, the selection of Pax as the central reverse motif carried profound political weight. Probus spent the majority of his six-year reign marching between the Rhine, Danube, and eastern frontiers to repel Germanic federations, suppress regional usurpers, and restore civil order. On issues produced at military mints like Siscia, the depiction of Pax was neither an idle philosophical invocation nor an assertion that conflict had permanently ceased. Instead, it represented the official doctrine of pacification achieved through military victory (pax parta victoriis). By pairing an aggressive, armed obverse portrait with a tranquil, branch-bearing Pax, the design communicated to both civilian populations and military units that imperial force was the indispensable prerequisite for peace and prosperity across the empire.

Epigraphy and Legends

The inscriptions on RIC V Probus 706 are uniform in their primary textual formulas, executed in a clean, legible Roman capital script characteristic of Siscia's die-engraving workshops. The obverse legend reads IMP C PROBVS P F AVG, representing the formulaic expansion: Imperator Caesar Probus Pius Felix Augustus. This inscription gathers the cardinal elements of third-century imperial legitimacy: Imperator evokes supreme military command; Caesar indicates the imperial house and sovereign rank; Pius Felix highlights religious piety, virtue, and divinely favored good fortune; and Augustus denotes supreme constitutional authority. The abbreviation is concise, leaving ample perimeter space on the flan for expansive portraiture. The reverse legend is simply PAX AVG, contracting Pax Augusti, meaning the Peace of the Emperor. In Roman imperial epigraphy, appending the genitive Augusti or its abbreviation AVG to a personified virtue bound that virtue directly to the living sovereign. It was not generic peace, but the specific, protective peace established and sustained through the emperor's vigilance and divine sanction. Below the reverse design, the exergual zone was reserved for mint signatures and workshop marks, such as XXI accompanied by officina indicators. These technical legends fulfilled administrative oversight requirements rather than propagandistic functions, documenting mint output and verifying alloy compliance for state treasurers.

Typology and Chronological Classification

In the standard reference work The Roman Imperial Coinage, Percy H. Webb catalogued this specific pairing of obverse title, diverse radiate busts, and reverse PAX AVG at Siscia under entry number 706 in Volume V, Part II. While Webb dated the broad issue to the full expanse of Probus's reign between AD 276 and 282, subsequent specialized research has refined the chronological sequence of Siscia's emissions. In his foundational study of Probus's coinage, Karl Pink arranged the production of Siscia into seven successive emissions based on shifting exergual marks, stylistic developments, and officina organization. Under Pink's classification, the PAX AVG type at Siscia spans multiple issue phases, appearing particularly prominent in emissions where the mint expanded from six to seven active workshops. The diversification of obverse bust types, especially the introduction of elaborate left-facing military and helmeted busts, aligns with the middle and later periods of Probus's reign, notably around AD 277 to 280, when Siscia celebrated imperial triumphs along the Danube. Modern corpora, including the ongoing Roman Imperial Coinage online initiative (OCRE) and Sylviane Estiot's studies of third-century radiate coinages, identify RIC 706 as a comprehensive type umbrella embracing several micro-varieties that are differentiated by specific combinations of bust orientation and exergual workshop codes.

Circulation and Archaeological Distribution

Excavation records and coin hoard discoveries demonstrate that antoniniani of Probus from Siscia circulated extensively throughout the central and western provinces of the Roman Empire. Because Siscia functioned as the principal coin supplier for the massive concentrations of troops stationed along the Danube, its products dominated monetary assemblies throughout Pannonia, Moesia, Dacia, and northern Italy. Major continental hoards, such as the La Venelia hoard in Italy and numerous Danubian river finds, consistently contain significant proportions of Siscian radiates featuring the PAX AVG reverse. Due to the extensive mobility of legionary detachments and imperial transport networks, specimens of RIC V Probus 706 also traveled far beyond the Illyrian provinces. British and Gaulish hoards from the late third century, including the massive Gloucester and Cunetio deposits, regularly include Siscian billon radiates, demonstrating that these coins integrated smoothly into mixed monetary pools alongside output from the western mints of Lugdunum and Rome. After Probus's assassination near Sirmium in AD 282, coins of this type remained in general circulation throughout the reigns of Carus, Carinus, and Numerian. They only ceased to function as official currency following the radical monetary reform introduced by Diocletian in AD 294 to 296, which systematically demonetized and recalled the pre-reform radiate billon issues in favor of the new nummus and radiate fraction.

References

1. Monnaies de l'Empire romain XII.1: D'Aurélien à Florien (270-276 après J.-C.). General introduction and Siscia mint historical survey
2. Coining Images of Power: Language and Representation of Pax on Roman Imperial Coinage. Brill, pp. 201-248
3. Roman Coins from the Earliest Times to the Fall of the Western Empire. Methuen, pp. 130-155
4. Online Coins of the Roman Empire: RIC V Probus 706. Type record ric.5.pro.706
5. Der Aufbau der römischen Münzprägung in der Kaiserzeit VI/1: Probus. Numismatische Zeitschrift 73, pp. 8-49
6. The Roman Imperial Coinage, Volume V, Part II. pp. 93, no. 706