Probus Billon Antoninianus RIC V Probus 650

Monetary and Economic Context

The antoninianus designated by RIC V Probus 650 was produced within the monetary framework established by Aurelian's coinage reform around AD 274. Intended to stabilize a monetary system ravaged by decades of debasement, this reform formalized the radiate radiate coin, or aurelianianus, as a tariffed billon denomination containing an explicit alloy standard of approximately twenty parts copper to one part silver, or around four to five percent silver content by weight. The surface was artificially enriched through chemical blanching during minting, giving freshly struck coins a bright, silvery sheen that wore away quickly during circulation. Under Probus (AD 276 to AD 282), the imperial administration continued this standard to meet significant fiscal burdens, predominantly the payment, rearmament, and retention of border troops stationed along the Rhine and Danube river frontiers. Siscia served as one of the premier Balkan mints tasked with supplying sound, uniform currency to civil administrators and legions stationed throughout the Danubian provinces.

Mint Organization and Production at Siscia

Production of RIC V Probus 650 was carried out exclusively at the imperial mint of Siscia, located at the confluence of the Colapis and Savus rivers. Siscia possessed a highly organized workshop structure that operated multiple numbered or lettered officinae, typically designated by Greek letters such as Alpha, Beta, Gamma, Delta, or Latin numerals. Dies for this type were cut by skilled engravers capable of executing intricate bust details and crisp epigraphy. The production of the CONCORD MILIT issue was extensive, utilizing multiple successive workshop emission sequences. Blanks were cast in moulds and struck using two hinged or aligned iron dies. The mint of Siscia made extensive use of exergual mintmarks, such as combinations of XXI alongside mint or workshop markers, which attested to the nominal silver-to-copper alloy ratio mandated by imperial monetary policy.

Obverse Iconography and Bust Varieties

A notable aspect of RIC V Probus 650 is the wide variety of obverse portrait compositions authorized under a single catalogue entry. While standard issues show Probus facing right with a radiate crown, wearing either a military cuirass or draped drapery, the issue is celebrated for its elaborate left-facing heroic busts. Among these variants, the emperor appears helmeted and radiate, armored in a cuirass, carrying a spear over his right shoulder and bearing a shield on his left arm, occasionally viewed from behind. Other dies present the emperor wearing the ornamented consular mantle, holding an eagle-tipped sceptre in his hand to commemorate his recurring imperial consulships. These dynamic obverse treatments reflected the vigorous military self-presentation of Probus, projecting both the watchful authority of an active frontline commander and the sacral majesty of the supreme magistrate.

Reverse Design and Symbolic Message

The reverse of RIC V Probus 650 presents a figurative depiction of mutual agreement and institutional loyalty. The central scene portrays Probus standing on the left or center facing right, clad in military dress, extending his right hand to grasp the hand of Concordia, who stands opposite him facing left. This dextrarum iunctio, or clasping of right hands, functioned as a venerable Roman symbol of covenant, marriage, and political concord. Concordia is frequently depicted wearing a long chiton and mantle, sometimes holding a cornucopia or standard in her free arm depending on engraver nuance. The scene directly visualizes the unity between the emperor and his armed forces. For an emperor elevated by Danubian legions, asserting military harmony through the reverse imagery was an urgent political statement aimed at preventing barracks mutinies and legitimizing dynastic authority.

Epigraphy and Legends

The obverse inscription on RIC V Probus 650 consistently reads IMP C M AVR PROBVS P F AVG, expanding to Imperator Caesar Marcus Aurelius Probus Pius Felix Augustus. This formal nomenclature combines military triumph, imperial lineage, and the conventional virtues of piety and good fortune. The reverse inscription reads CONCORD MILIT, an abbreviated form of Concordia Militum, translating to Harmony of the Soldiers. The lettering on Siscian dies is rendered in regular, compact Roman capitals. The exergue and reverse field typically carry workshop indicators and the value signature XXI or related abbreviations, verifying both the specific production atelier and compliance with the official post-reform metallurgic standard.

Typology and Chronological Classification

Within the typology established by Percy H. Webb in Roman Imperial Coinage and refined chronologically by Karl Pink, RIC V Probus 650 falls within the intermediate to late emission phases at Siscia between AD 276 and AD 282. Pink's analysis of the mint sequences showed that Siscian antoniniani progressed through distinct emission systems characterized by specific field marks, exergual arrangements, and obverse stylistic developments. The CONCORD MILIT type at Siscia belongs to recurring thematic series celebrating imperial army cohesion, struck alongside related types honoring Pax and Victoria. Because the type encompasses multiple obverse bust forms across different officinae, numismatists recognize it not as a single isolated strike, but as an enduring core production type spanning multiple emission packages across the reign.

Circulation, Hoards, and Archaeological Context

Antoniniani of the RIC V Probus 650 type circulated predominantly in the central and northern Balkan provinces, including Pannonia Superior, Pannonia Inferior, and Upper Moesia, while also travelling along major military roads toward northern Italy and Gaul. Siscian coinage frequently appears in third-century coin hoards discovered throughout the Roman Empire, such as the Venera hoard in Italy and numerous Danubian border hoards. These deposits demonstrate that billon antoniniani remained in active circulation through the early Tetrarchic period, until Diocletian's monetary reforms of AD 294 systematically replaced the old radiate coinage with the newly tariffed nummus and reduced radiates. Wear patterns on recovered specimens demonstrate that coins of this type often saw extensive transactional use before final burial or recall.

References

1. Online Coins of the Roman Empire: RIC V Probus 650. ric.5.pro.650
2. Der Aufbau der römischen Münzprägung des Kaiserzeit, VI/1: Probus. pp. 5-74
3. The Roman Imperial Coinage, Volume V, Part I. p. 86