Probus Antoninianus RIC V Probus 155

Monetary Context and the Reformed Radiate

The coinage of Emperor Probus (276 to 282 AD) represents a consolidation of the imperial currency system established by Aurelian's monetary reform of 274 AD. Throughout the mid-third century AD, rampant inflation and military emergencies had caused the debasement of the silver antoninianus to a meager alloy often containing less than two percent silver. Aurelian stabilized this crisis by formalizing a reformed radiate denomination, commonly called the aurelianianus, which maintained a controlled weight standard averaging around 3.8 to 4.2 grams and a specified fineness of twenty parts copper to one part silver (five percent silver by weight). This metallic standard was frequently affirmed by the value mark XXI in the Latin West or KA in the Greek-speaking East, advertising state guarantee of value. Under Probus, this reformed billon radiate functioned as the backbone of everyday military disbursements, civil payments, and commercial transactions across the Roman world. Although modern numismatic literature frequently records the denomination as silver, metallurgically it consists of an argentiferous bronze core that received a chemical surface treatment or blanching process prior to striking, producing a gleaming silvered layer on the newly minted coins. The Adventus type catalogued as RIC V Probus 155 fulfilled this standard denominational role, combining high-volume production for the imperial army with potent state messaging regarding the sovereign's legitimacy, security, and military triumph.

Production and the Rome Mint

RIC V Probus 155 was struck exclusively at the imperial mint of Rome, which operated as the primary monetary workshop for central Italy and the nearby legions. During the reign of Probus, the Rome mint was organized into six or seven administrative workshops, designated as officinae. Each workshop was responsible for specific issues and differentiated its output using mintmarks and control marks struck into the lower field or the exergue of the reverse die. The mechanical preparation of these radiates required precise metallurgical casting of bronze flans, an electrolytic or acid-leaching dip to draw native silver to the surface, and rapid double-die striking. Dies were engraved by skilled artisans under strict imperial supervision, resulting in the distinctive compact, muscular style of Rome's die-cutters during this period. On reverses of RIC V Probus 155, the Rome mint identified the producing workshop through combinations such as an initial 'R' followed by a workshop numeral (such as Greek letters Alpha through Zeta or Latin numerals) or subsidiary symbols including thunderbolts, crescents, and stars. While Percy Webb's cataloguing in RIC V.2 gathered these variants under the overarching entry 155, die studies demonstrate that multiple workshops struck the type across successive production batches.

Obverse Iconography and Imperial Portraiture

The obverse of RIC V Probus 155 presents the portrait bust of Probus facing right, crowned with the solar radiate crown that traditionally identified the double-denarius or antoninianus denomination since its introduction under Caracalla. The Rome mint employed two distinct bust variations for this issue: a bust that is radiate, draped, and cuirassed when viewed from the back or side, and a bust that is radiate and cuirassed alone, showing the scales or breastplate of the imperial military cuirass without drapery. The portraiture aligns closely with the militaristic iconography of the Illyrian soldier-emperors. Probus is depicted with closely cropped hair, a neatly trimmed military beard indicated by short stippled incisions, a prominent jawline, and furrowed brows that convey vigilant command and discipline. Unlike the highly stylized or heroic conventions of early imperial portraiture, the Rome mint portraits under Probus emphasise stern military leadership, reassuring troops and citizens of the ruler's personal competence as commander-in-chief in an era of incessant external threats.

Reverse Typology and Adventus Symbolism

The reverse design of RIC V Probus 155 features the equestrian figure of Emperor Probus advancing toward the left. He is depicted in full military uniform, riding a caparisoned horse whose right foreleg is raised in motion. The emperor raises his right hand in the traditional gesture of adlocutio and greeting (salutatio), acknowledging the crowd or the senate, while his left hand holds a long upright sceptre or spear, embodying his civil and military authority. Beneath the raised foreleg of the horse sits or kneels a diminutive barbarian captive, often depicted with hands tied behind the back or turned toward the rider in submission. This captive represents the defeated enemies of the state, particularly the Germanic and Sarmatian tribes subdued during Probus's campaigns along the Rhine and Danube frontiers. The presence of the captive transforms the image from a simple administrative arrival into a triumphal ceremony, advertising that the emperor's entry into the city is directly enabled by his battlefield victories. The composition was an established visual trope in imperial art, serving as a dynamic numismatic counterpart to imperial statues and triumphal reliefs erected in the capital.

Epigraphy and Legend Analysis

The inscriptions of RIC V Probus 155 are concise, adhering to standardized formulae developed during the late third century AD. The obverse legend reads IMP PROBVS P F AVG, expanding to Imperator Probus Pius Felix Augustus. The title Imperator functions as the praenomen of command, followed by the emperor's cognomen Probus, and the paired virtues Pius Felix ('dutiful and fortunate'), which had become an inseparable imperial epithet since the Severan dynasty. The legend concludes with Augustus, the supreme constitutional designation of imperial majesty. By omitting iterative offices such as the tribunician power (Tribunicia Potestas) or consulships, the obverse legend remains typologically stable across multiple years of his reign. The reverse inscription reads ADVENTVS AVG, expanding to Adventus Augusti ('The Arrival of the Augustus'). This legend had been celebrated since the early empire to mark an emperor's formal ceremonial entry into Rome or a major provincial metropolis. In third-century numismatics, the Adventus Augusti legend served both specific historical announcements and timeless ideological declarations, reassuring the Roman populace that the emperor had returned safely to the heart of the empire to secure governance, conduct religious rituals, and distribute imperial largesse.

Typological Classification and Chronological Placement

In the fundamental framework of Roman Imperial Coinage Volume V, Part II, compiled by Percy H. Webb, entry 155 is catalogued under the mint of Rome without internal division into minor emission numbers. However, subsequent chronological studies, particularly the seminal work of Karl Pink on the structure of Probus's coinage, organized the Rome issues into distinct chronological phases or emissions between 276 and 282 AD. Pink assigned the early Adventus issues of Rome to the emperor's first major arrival in the capital in late 276 or early 277 AD, following his recognition by the Roman Senate after the death of Florian. Later emissions of similar Adventus types were struck to celebrate subsequent entries, such as his return to Rome in 281 AD for his celebrated triumph over the Germans and Blemmyes. The sequence of these strikings can be traced through the evolution of the mintmarks in the exergue, moving from simple workshop letters (such as R followed by Greek letters) to more elaborate systems incorporating symbols such as thunderbolts or stars, and eventually standardizing the XXI value mark alongside officina designations. As a result, RIC V 155 constitutes a broad typological grouping that encompasses distinct chronological emissions across Probus's six-year reign.

Circulation, Hoard Evidence, and Demonetization

Radiate coins of RIC V Probus 155 circulated extensively within the Roman Empire, as evidenced by their presence in numerous coin hoards from Britain, Gaul, Italy, and the Danubian provinces. In hoard contexts, these reformed radiates frequently occur alongside issues of Aurelian, Tacitus, and Florian, as well as contemporaneous provincial strikings from Siscia, Lugdunum, and Ticinum. The surviving specimens illustrate varying degrees of wear on the silvered surface layer, showing that while the silver wash often wore away in commercial circulation, the coins retained their purchasing power based on imperial tariff rather than intrinsic metal weight. Hoards concealed during the late 280s AD and the 290s AD, such as those buried in response to the usurpations of Carausius and Allectus in Britannia or Germanic incursions along the Rhine, demonstrate that the antoniniani of Probus remained in active circulation for nearly two decades after his death. Their formal role in commerce began to diminish following Diocletian's monetary reform of 294 AD, which introduced the silver argenteus and the bronze nummus (follis), retariffing old radiates at reduced nominal rates until they were gradually phased out or melted down in the opening years of the fourth century AD.

References

1. Monnaies de l'Empire romain XII.1: D'Aurélien à Florien (275-276 après J.-C.). pp. 85-98
2. Online Coins of the Roman Empire: RIC V Probus 155. ric.5.pro.155
3. Der Aufbau der römischen Münzprägung in der Kaiserzeit: VI/1. Probus. Numismatische Zeitschrift 73 (1949), pp. 13-74
4. The Roman Imperial Coinage, Vol. V, Part II. p. 34, no. 155