Postumus Billon Antoninianus, RIC V Postumus 55

Monetary Context and the Gallic Secession

The antoninianus RIC V Postumus 55 was issued in the turbulent aftermath of the capture of Valerian I by the Sasanian Empire and the subsequent fragmentation of the Roman state. Assuming power in AD 260, Postumus established an autonomous Romano-Gallic administration governing Gaul, Britannia, and initially parts of Hispania and Germania. To bolster trust in his administration and sustain the military loyalty of the Rhine frontier legions, Postumus initiated an aggressive monetary policy. While the central Roman antoniniani issued under Gallienus experienced rapid debasement during the early 260s AD, Postumus deliberately maintained a comparatively superior silver alloy for his early radiate double denarii. RIC V Postumus 55 belongs to this initial phase of Gallic monetary confidence. The coin served as the daily workhorse denomination of the army, mediating military pay, supply procurement, and commercial exchange throughout the northwestern territories while projecting an image of traditional Roman discipline, fiscal responsibility, and restored imperial security.

Mint Location and Production Standards

In the standard reference corpus of Roman Imperial Coinage Volume V, Percy H. Webb assigned RIC V Postumus 55 to the primary imperial mint of Lugdunum (modern Lyon). However, the precise operational location of Postumus's primary early mint has been extensively debated in twentieth-century and contemporary scholarship. Georg Elmer proposed that the initial workshops operated at Colonia Claudia Ara Agrippinensium (Cologne) or that an administrative mint moved between military headquarters in response to defense priorities along the Rhine frontier. Later hoard analyses, including those of the Cunetio and Normanby finds, demonstrate stylistic continuity within Postumus's primary mint sequence, whether localized at Lyon, Trier, or Cologne. The production of RIC V Postumus 55 utilized carefully engraved dies executed by skilled die-cutters who broke away from the stylized, hasty portraiture typical of late Gallienic Rome. Struck in billon with an intentional silver wash or surface enrichment, these coins typically achieved a target weight between 2.8 and 3.4 grams, conforming to the prevailing Gallic standard for the early AD 260s.

Obverse Iconography and Variations

The obverse of RIC V Postumus 55 presents a mature, highly individualized portrait of the emperor facing right. Postumus is characterized by a prominent, carefully textured beard, a straight nose, and deep-set eyes, conveying gravitas and seasoned military competence. As an antoninianus, the coin invariably features the radiate crown, the classic indicator of the double-denarius denomination since its introduction under Caracalla. Typological varieties within this specific issue encompass differences in the bust dress: specimens are catalogued with either a draped bust seen from the side, a draped and cuirassed bust showing military epaulets and armor plates, or a simpler radiate head with minimal truncation. The naturalistic rendering of Postumus's features distinguished his coinage from the increasingly schematic imperial portraiture of contemporary Rome, establishing an iconic visual brand across the Gallic realm.

Reverse Design and Imperial Symbolism

The reverse of RIC V Postumus 55 depicts the emperor standing in contrapposto facing left, dressed in military garments (paludamentum and cuirass). In his extended right hand he supports a celestial globe, while his left hand rests upon a transverse or vertical spear. This composition embodies the traditional Roman motif of the emperor as rector orbis (ruler of the world) and triumphant commander. By holding the globe, Postumus actively laid claim to universal Roman authority, refuting any notion that his state was merely an illegitimate regional break-away. The spear underlines his vigilant role as protector of the Rhine limes and safeguard of civil peace. The absence of additional field marks or mintmark letters in the exergue is characteristic of Postumus's early issues, which relied entirely on the distinct artistic style and full titulature to confirm official origin.

Inscriptions and Epigraphic Analysis

The inscriptions on RIC V Postumus 55 are formulated in classical Latin epigraphy and reinforce Postumus's formal imperial credentials. The obverse legend reads IMP C POSTVMVS P F AVG, expanding to Imperator Caesar Postumus Pius Felix Augustus. This traditional formula asserts his supreme military command (Imperator), dynastic standing (Caesar), dutiful piety and good fortune (Pius Felix), and sovereign majesty (Augustus). The reverse legend, P M TR P COS III P P, provides the crucial chronological framework, expanding to Pontifex Maximus, Tribunicia Potestate, Consul Tertium, Pater Patriae. The inscription records his position as chief priest of the Roman religion, his ongoing tribunician sacrosanctity, his third consulship, and his designation as Father of his Country. The lettering is cleanly engraved with classical serifs, avoiding the blundered forms common on later contemporary imitations.

Typology and Chronological Classification

Within the typology of the Gallic Empire, RIC V Postumus 55 holds an essential diagnostic position. The reference in the reverse legend to the third consulship (COS III) provides a definite terminus post quem. Under the traditional chronology established by Webb in RIC V, this issue was assigned to AD 261. Subsequent reassessments by Georg Elmer in 1941 and revisions developed by Jerome Mairat and Roger Bland have examined the succession of Postumus's tribunician renewals and consular years in detail. While some scholars debate whether his third consulship began in January AD 261 or extended into early AD 262, the issue clearly belongs to the early, consolidative phase of his reign, preceding the rapid weight declines of the late 260s AD. This type directly followed the COS II series and preceded the more complex allegorical types celebrating military victories and pacification.

Hoard Evidence and Circulation Patterns

Coins of RIC V Postumus 55 circulated widely throughout Roman Gaul, the Germanies, and Roman Britain, remaining in active use for years after their initial striking. Major British hoards, such as the Cunetio Hoard and the Normanby Hoard, contained representative samples of this type alongside other early Postumus radiates. Because of their higher initial silver content relative to later Gallic issues struck under Victorinus and Tetricus I, early radiates of Postumus like RIC V 55 were frequently hoarded during the economic disruptions of the late 260s and early 270s AD. Furthermore, their reliable standard led to widespread acceptance across the regional economy, and their recognizable portrait styles frequently served as prototypes for local barbarous radiates produced after the collapse of the Gallic Empire.

References

1. The Cunetio Treasure: Roman Coinage of the Third Century AD. British Museum Publications, London (1983)
2. Die Münzprägung der gallischen Kaiser in Köln, Trier und Mailand. Abhandlungen der Bayerischen Akademie der Wissenschaften, Phil.-hist. Abt., N.F. 18 (1941)
3. The Coinage of the Gallic Empire. Doctoral dissertation, University of Oxford (2014)
4. Online Coins of the Roman Empire: RIC V Postumus 55. ric.5.post.55
5. The Roman Imperial Coinage, Volume V, Part II. p. 341, no. 55