Herennius Etruscus Silver Antoninianus, RIC IV Trajan Decius 138

Monetary Context

During the mid-third century AD, the Roman imperial monetary system experienced intense structural strains brought on by persistent border conflicts, civil instability, and expanding military obligations. Under Trajan Decius, who seized the principate in AD 249, the double denarius or radiate antoninianus served as the workhorse denomination of official state expenditure. First created under Caracalla in AD 215, the radiate coin had effectively superseded the traditional denarius in regular market circulation and treasury dispatches by the end of the AD 230s. The coin carried an official tariff of two denarii, yet its physical weight of roughly 3.5 to 4.2 grams and a silver fineness that fluctuated between forty and forty-five percent yielded an intrinsic intrinsic value substantially lower than two pure denarii. Consequently, the denomination functioned as an overvalued fiat currency whose viability depended on public and military trust in imperial stability. By issuing antoniniani for his elder son, Herennius Etruscus, alongside his own imperial radiates, Decius integrated dynastic succession into daily monetary transactions. The production of RIC IV Trajan Decius 138 was tied directly to state pay, military provisioning, and the ideological celebration of collegial unity in the face of acute external threats along the Danubian frontier.

Production and Mints

The entire attested volume of RIC IV Trajan Decius 138 was struck by the principal imperial mint at Rome. During the reign of Trajan Decius, the urban mint operated with six distinct officinae or working workshops, though individual coins of this issue did not bear explicit officina marks in the field or exergue. Dies were hand-engraved by seasoned craftsmen who maintained a coherent stylistic standard across Decius's familial issues. Die-axis alignment was predominantly adjusted to the six o'clock position, reflecting the consistent mechanical habits of the urban moneta. The silver alloy was prepared in centralized melts using recycled silver currency diluted with copper, leading to characteristic trace-element variations. Flan preparation involved pouring molten alloy into open-air hemispherical moulds or flattening cast droplets, which were then cold-struck or struck while slightly heated between iron or bronze dies. The high pressure required to imprint both the detailed draped bust on the obverse and the clasped hands on the reverse occasionally created radial edge fissures, typical of rapid mass production in a military-focused state mint.

Obverse Design and Portraiture

The obverse presents a right-facing portrait bust of Herennius Etruscus depicted as a youth. In accordance with the iconographic conventions of the denomination, he wears a radiate crown, whose spiked solar rays serve as the primary visual marker distinguishing the double denarius from the laurel-crowned single denarius. He is shown draped, with the fabric of his mantle pinned at the right shoulder and gathered across the chest in soft, realistic folds. Engravers at the Rome mint captured the facial features of the young prince with clean, linear realism: a straight nose, a smooth jawline free of heavy stubble, and compact cropped hair framed neatly beneath the crown band. The style deliberately echoes the serious, classicizing artistic trends revived under Decius, avoiding the extreme military abstraction seen later in the third century while distinguishing Herennius from the mature, furrowed-brow portraiture of his father.

Reverse Iconography

The reverse of RIC IV Trajan Decius 138 is occupied by two clasped right hands (dextrarum iunctio), arranged horizontally across the center of the field. This ancient Roman symbol communicated concord, mutual fidelity, and institutional pacts between equals or collegiate authorities. First popularized on Roman Republican and Civil War issues, the clasped hands were frequently paired with legends expressing military loyalty (Fides Militum) or civil accord (Concordia). Here, the motif emphasizes the reciprocal trust binding the supreme emperor Trajan Decius, his consort Herennia Etruscilla, and their designated heir Herennius Etruscus. The composition is austere and uncluttered; no extraneous attributes such as caducei or cornucopiae appear beside the hands. The fingers are rendered with articulated joints and thumbs pressed gently together, creating an intimate, balanced focal point intended to inspire confidence among soldiers receiving their stipendium.

Legends and Epigraphy

The obverse legend reads Q HER ETR MES DECIVS NOB C, which abbreviates Quintus Herennius Etruscus Messius Decius Nobilissimus Caesar. This formal titulature documents his descent from his father (Messius Decius) and mother (Herennia Etruscilla) while affirming his constitutional status as Nobilissimus Caesar, the designated successor to the imperial purple. The lettering is set along the perimeter clockwise from the lower left, rendered in neat Roman capitals with distinct serifs. On the reverse, the legend CONCORDIA AVGG expands to Concordia Augustorum, denoting 'Concord of the Augusti'. While the abbreviation AVGG grammatically signifies multiple emperors holding the rank of Augustus, Herennius held only the junior title of Caesar at the time of striking. The use of the plural Augusti either reflected an overarching standard mint formula for collegiate rule used concurrently on coins of Decius and Etruscilla, or prematurely celebrated the dynastic partnership that would officially culminate in Herennius's elevation to Augustus in the spring of AD 251.

Typology and Chronological Sequence

Herennius Etruscus was proclaimed Caesar by his father around mid-AD 250, inaugurating his first substantial series of coins at the Rome mint. RIC IV Trajan Decius 138 belongs to this initial phase of his numismatic output, struck between the summer of AD 250 and his promotion to co-Augustus alongside Decius around May AD 251. It forms part of a coordinated suite of Caesar types that included allegorical depictions of Pietas, Spes, and Princeps Iuventutis. Within Harold Mattingly and Edward Sydenham's Roman Imperial Coinage classification, this issue is categorized under the junior Caesar series for the reign of Trajan Decius. When Herennius was subsequently promoted to full Augustus in AD 251, his obverse legend was altered to IMP C Q HER ETR MES DECIO AVG, bringing an abrupt end to the striking of the NOB C series. The production window for RIC 138 was therefore limited to approximately nine to twelve months, terminating prior to Herennius's death at the Battle of Abrittus in June AD 251.

Circulation, Hoards, and Survival

Because it was struck during a period of massive military mobilization against the Gothic incursions across the lower Danube, RIC IV Trajan Decius 138 saw rapid disbursement through military supply channels. Specimens moved quickly from Rome to legionary stations in Moesia, Thrace, and Pannonia, as well as into western garrisons along the Rhine. The type occurs regularly in mid-third-century coin hoards throughout Britain, Gaul, the Balkans, and Italy, often found alongside radiates of Philip I, Trebonianus Gallus, and Valerian. Due to its moderately high silver content relative to the disastrously debased billon radiates struck under Gallienus after AD 260, specimens of RIC 138 were frequently culled by Gresham's Law or melted down in later recoinage programs. Nevertheless, numerous specimens survived in savings hoards buried prior to the monetary reforms of Aurelian in AD 274, providing modern scholars with a clear view of the coin's weight distributions and die links.

References

1. Coin Hoards and Hoarding in the Roman Empire. pp. 85-98
2. Coinage in the Roman Economy, 300 B.C. to A.D. 700. pp. 130-142
3. Roman Coins from the Earliest Times to the Fall of the Western Empire. pp. 128-135
4. Online Coins of the Roman Empire: RIC IV Trajan Decius 138. ric.4.tr_d.138
5. The Roman Imperial Coinage, Vol. IV, Part III: Gordian III - Uranius Antoninus. pp. 138-141