Philip II Silver Antoninianus, RIC IV Philip I 218D

Monetary Context and Dynastic Policy

The antoninianus, originally introduced by Caracalla in AD 215 as a radiate double denarius, had become the primary silver denomination of the mid-third-century Roman monetary system by the reign of Philip I (AD 244 to 249). Although officially tariffed at two denarii, the denomination had never contained twice the intrinsic silver content of a contemporary denarius. By the mid-240s AD, economic pressures, mounting frontier defense costs, and a substantial peace indemnity paid to the Sasanian king Shapur I compelled the imperial administration to maintain a debased alloy, typically averaging around forty to forty-five percent silver with the balance composed of copper and trace elements. Upon assuming the purple along the Euphrates following the demise of Gordian III in February or March of AD 244, Philip acted swiftly to consolidate his family's authority. His young son, Marcus Julius Philippus Severus, born circa AD 237, was invested with the title of Caesar shortly after the new regime established control. Coinage was immediately enlisted to project dynastic permanence to the legions, the Roman populace, and the Senate. The issue of RIC IV Philip I 218D belongs to this initial phase of dynastic messaging, serving the dual role of supplying coin for imperial expenses while cementing the public status of the new heir.

Mint Organization and Production Techniques

RIC IV Philip I 218D was struck exclusively at the principal imperial mint in Rome. During the reign of Philip I, the mint of Rome operated using a structured system of six distinct workshops, or officinae, which divided production between the senior emperor, Empress Otacilia Severa, and young Philip II Caesar. Officina assignments in the early reign were generally unmarked on the flans themselves, as explicit workshop numerals in the exergue did not become systematic until the celebration of the Roman Millennium in AD 248. Production followed standard Roman striking techniques. Blanks were cast in open or clustered molds and hot-struck between hand-cut iron dies. The silver alloy of this period exhibits significant surface enrichment caused by acid pickling, a process that dissolved base copper from the exterior of the blank prior to striking, creating a temporary bright silver sheen. Metrological surveys for Rome antoniniani of this issue indicate a theoretical weight standard centering around 4.00 grams, but actual weights exhibit wide dispersion, commonly falling between 3.20 and 4.80 grams with typical flan diameters ranging from 21 to 24 millimeters. Die alignment is predominantly regular at six o'clock or twelve o'clock, reflecting careful die positioning within the Rome workshops.

Obverse Iconography and Portraiture

The obverse of RIC IV Philip I 218D presents the portrait of Philip II as Caesar facing right. Numismatists classify this bust as radiate, draped, and cuirassed, viewed from the side or slightly from behind. The radiate crown serves as the defining mark of the antoninianus denomination, a visual convention maintained since the time of Caracalla to distinguish the double denarius from the laureate denarius. The engraving portrays Philip II with juvenile, idealized facial features reflecting his actual youth, as he was approximately seven to nine years of age during the striking of this issue. He is depicted with short-cropped military hair, a straight nose, and smooth, unblemished cheeks, devoid of the facial hair seen on portraits of his father. The combination of paludamentum (military cloak) draped over a scaled or plate cuirass symbolically projects both martial readiness and imperial station despite the prince's tender years. Minor stylistic variations exist among surviving dies, ranging from compact, delicate facial rendering to broader, more robust features cut by different engravers at the Rome mint.

Reverse Iconography and Symbolism

The reverse of the type displays a standing military figure of Philip II facing left. In his outstretched right hand, the prince holds a celestial globe, while his left hand supports an upright military standard (signum). He is dressed in classical Roman military habit, wearing a tunic, cuirass, and a cloak that hangs over his shoulder or wraps around his left arm. Every visual element of this reverse carries heavy ideological weight. The globe was a centuries-old emblem of cosmic and earthly dominion, signifying that the young Caesar shared in the destiny of worldwide rule. The military standard directly invoked the loyalty of the armed forces, asserting that the army's allegiance extended to the young boy as the guarantor of dynastic stability. The type RIC IV 218 is notable for its minute reverse variations across different sub-types, wherein the prince may hold a spear instead of a standard, or hold the standard vertically rather than transversally; variety 218D is strictly defined by the combination of the globe in the right hand and the vertical standard in the left hand.

Epigraphic Form and Imperial Titulature

The obverse legend on RIC IV Philip I 218D reads continuously around the portrait: M IVL PHILIPPVS CAES. This concise text abbreviates the prince's formal name and rank, Marcus Iulius Philippus Caesar. By omitting the title Augustus, the legend firmly positions Philip II as the junior partner and designated heir, subservient to his father's supreme executive and military command. The reverse inscription reads PRINCIPI IVVENT, an abbreviation of the ancient honorary formula Principi Iuventutis ('To the Prince of the Youth'). Dating back to the designation of Gaius and Lucius Caesar by Augustus, this prestigious title had been revived repeatedly during the Julio-Claudian, Antonine, and Severan periods as the preeminent honorific for an imperial heir. It highlighted the Caesar's nominal leadership over the ordo equester and the young noblemen of Rome. The lettering on both faces exhibits the typical epigraphic character of mid-third-century Rome, marked by neat, square capital letters with distinct triangular serifs, though occasional dies display slightly compressed letter spacing to accommodate the full perimeter legend.

Typology and Chronological Placement

RIC IV Philip I 218D belongs to the earliest series of coins struck for Philip II, dating securely between the summer of AD 244 and the closing months of AD 246. The terminus post quem is provided by the arrival of news in Rome confirming Philip I's elevation in the spring of AD 244, followed closely by the Senate's formal confirmation of Philip II as Caesar. The issue continued uninterrupted through subsequent emission phases until early AD 247, when Philip II was elevated to co-Augustus alongside his father, after which his coin legends abruptly changed to include AVGVSTVS and IMP. Within the classification system developed by Harold Mattingly and Edward A. Sydenham in Roman Imperial Coinage, catalogue number 218 encompasses several distinct bust and attribute configurations. While 218A features a bare or draped bust without cuirass, and 218B and 218C present variations with a transverse spear instead of a standard, 218D represents the specific pairing of the fully armored and draped radiate bust with the globe-and-standard reverse. Distinguishing this exact entry is essential for precise typological cataloguing, as contemporary antoniniani of Philip II also employ the reverse legend PRINCIPI IVVENT with seated figures of the prince or depictions showing a captive at his feet.

Circulation, Hoard Evidence, and Survival

Antoniniani of the Principi Iuventutis type circulated widely across the Roman Empire, integrated into the general mass of billon coinage that fueled both civilian commerce and military supply networks during the Crisis of the Third Century. Large hoard discoveries from Britain, Gaul, the Rhine frontier, and the Danubian provinces regularly yield high proportions of Philip I and Philip II antoniniani, reflecting the intense monetization of border zones during this period. Because the alloy contained substantial base metal, specimens recovered from subterranean hoard contexts often exhibit dark silver-gray or slightly green surfaces due to the oxidation of surface copper. Wear patterns in hoards deposited during the 250s and 260s AD show that these coins remained active in circulation for several decades, even as subsequent emperors like Valerian and Gallienus further reduced the silver purity of new issues. The Gresham-like effect eventually led to older, comparatively higher-silver coins of the 240s AD being preferentially hoarded. Today, RIC IV Philip I 218D is relatively well represented in museum trays and private collections, providing scholars with a clear tangible record of third-century dynastic self-presentation.

References

1. The Coinage of the Mid-Third Century AD: A Summary of Recent Work. pp. 125-144
2. The Roman Imperial Coinage: The Denarii and Antoniniani of Philip the Arab. pp. 45-52
3. Coinage in the Roman Economy, 300 B.C. to A.D. 700. pp. 125-132
4. Coining Images of Power: Patterns in the Representation of Roman Emperors on Imperial Coinage, A.D. 193-284. pp. 200-225
5. Online Coins of the Roman Empire: RIC IV Philip I 218D. Type ric.4.ph_i.218D
6. The Roman Imperial Coinage, Vol. IV, Part III: Gordian III - Uranius Antoninus. pp. 95-96, no. 218d