Caligula Silver Denarius, RIC I (second edition) Gaius/Caligula 2

Monetary Context and Imperial Policy

When Tiberius died in March of AD 37, the Roman monetary system inherited both fiscal stability and urgent political demands. Tiberius had accumulated substantial treasury reserves, but his conservative financial management and limited public spending had occasionally constrained imperial liquidity. Upon his accession at the age of twenty-four, Gaius faced the immediate necessity of affirming his legitimacy, satisfying testamentary bequests left by Tiberius and Livia, and paying substantial cash donatives to the Praetorian Guard and legionaries. Silver denarii represented the primary medium for these high-level state expenditures, military disbursements, and official remunerations across the provinces. RIC I (second edition) Gaius/Caligula 2 belongs to the opening phase of this monetary distribution. By commissioning a new silver issue early in AD 37, the new administration satisfied the structural demand for precious metal currency while pursuing an unmistakable propaganda agenda. The denomination functioned as the backbone of Roman commercial and fiscal accounting, struck in fine silver alongside the gold aureus. The introduction of Gaius's portrait alongside that of Divus Augustus signaled a direct return to Augustan ideals, repudiating the austere and secluded public posture of Tiberius's final years on Capri. Through this issue, the state asserted continuity of the Principate and the restored vitality of the Julio-Claudian house.

Production Standards and the Mint Attribution Debate

The operational origins of RIC I (second edition) Gaius/Caligula 2 form one of the classic debates of early imperial numismatics. In the original 1923 edition of the Roman Imperial Coinage and reiterated by C. H. V. Sutherland in the 1984 second edition, Gaius's precious metal coinage was catalogued under the imperial mint of Lugdunum (Lyon, France). This attribution rested on the long-standing model that Lugdunum operated as the sole official mint for western gold and silver from late in the reign of Augustus through much of the Julio-Claudian era, while Rome supposedly struck only aes base-metal issues. This division has been heavily revised by modern scholarship. Detailed die studies, metallurgical comparisons, and institutional analyses by scholars such as Jean-Baptiste Giard, Andrew Burnett, and Sutherland himself in later commentaries have demonstrated that precious metal production had likely shifted to the capital during the later reign of Tiberius or at the accession of Gaius. The stylistic coherence between the portraiture of the denarii and contemporary Roman bronze coinage, alongside historical evidence regarding the immediate payment of accession donatives in the capital, strongly supports the mint of Rome as the primary production site. Nevertheless, the type continues to be indexed under the traditional Lugdunum heading in major catalogues, including RIC and OCRE, making precise historiographical awareness essential. Technically, the denarius conformed to the Augustan weight standard. Struck from refined silver with an alloy purity exceeding ninety-five percent, full-weight specimens typically center around 3.70 to 3.85 grams, with an intended benchmark around 1/84 of a Roman pound (libra). The coin was struck using hinged or firmly held upper dies, yielding a regularized alignment, predominantly oriented to twelve o'clock (or six o'clock on select reverse dies).

Obverse Design and Portraiture

The obverse of RIC 2 presents a right-facing, bare-headed portrait of Gaius. Stylistically, the image reflects an idealized yet distinct likeness of the emperor at his accession in his mid-twenties. The hair is rendered in carefully arranged, straight locks brushed forward from the crown and falling neatly over the brow, adhering closely to the dynastic Julio-Claudian artistic conventions established under Augustus and refined during the youth of Germanicus. The profile shows a high, straight forehead, a prominent nose, and a firm, slightly protruding chin. Unlike later issues that occasionally exhibit increasingly severe or heavy features, this inaugural type emphasizes youth, vitality, and family resemblance. The omission of a laurel wreath or any other divine attribute on the obverse is notable; Gaius appears bareheaded as a mortal magistrate and civil princeps, respecting traditional Republican sensibilities while permitting his supreme authority to be communicated solely through his titulature and the radiant divinity of his reverse.

Reverse Iconography: Divus Augustus and Astral Symbolism

The reverse of the denarius features the head of Augustus facing right, crowned with a radiate diadem (corona radiata). Flanking the portrait are two distinct stars, placed in the left and right fields. Entirely devoid of an accompanying legend, the imagery operates through pure symbolic association, allowing the radiant crown and celestial symbols to convey the message of divine status. In Roman visual culture, the corona radiata was an explicit marker of divinity, traditionally associated with the sun god Sol and reserved on imperial coinage exclusively for deceased, deified rulers (divi). By depicting Augustus with this crown, the coin honors him as Divus Augustus Pater, the celestial patron of the empire and grandfather of Gaius's mother, Agrippina the Elder. The two stars reinforce this astral dimension. They recall the famous Julian comet (sidus Iulium) that appeared at the funerary games of Julius Caesar in 44 BC, which had originally signaled divine transformation. The dual stars have been interpreted by numismatists as representing either the paired heavenly aspects of the Julian line or celestial protectors watching over the dynasty. By uniting his own portrait on the obverse with that of Divus Augustus on the reverse, Gaius achieved a profound ideological objective. Tiberius had spent his final decades detached from the public eye, and his memory was greeted with widespread ambivalence. Gaius bypassed Tiberius almost entirely, tethering his imperial authority directly to the charismatic foundation of Augustus.

Epigraphy and Titulature Analysis

The obverse inscription reads: C CAESAR AVG GERM P M TR POT COS. This compact Latin legend records the essential constitutional components of Gaius's newly acquired authority, utilizing standard epigraphic abbreviations. The name begins with 'C CAESAR' (Gaius Caesar), omitting the praenomen-like use of 'Imperator' in accordance with his early preference for personal and dynastic naming. 'AVG' abbreviates Augustus, the sacred cognomen conferred by the Senate at his accession. 'GERM' (Germanicus) was an inherited triumphal surname, commemorating the renowned military campaigns of his father, Germanicus Julius Caesar, whose immense popularity among both the urban populace and the frontier legions served as an indispensable pillar of Gaius's political strength. The accompanying offices establish the administrative chronology of the strike. 'P M' represents Pontifex Maximus, the supreme priesthood of Rome, which was bestowed upon Gaius shortly after his arrival in the capital in the spring of AD 37. 'TR POT' (Tribunicia Potestate) designates the grant of tribunician power, the constitutional instrument of civil oversight. The absence of an iterative numeral signifies his first year holding the power. Finally, 'COS' denotes the consulship, reflecting his entry into his first consulship on July 1, AD 37, which he held alongside his uncle Claudius. The reverse bears no inscription whatsoever, an intentional artistic choice that emphasizes the visual sanctity of the radiate head of Augustus.

Typological Sequences and Chronological Framework

RIC I (second edition) Gaius/Caligula 2 occupies an exact chronological window within the coinage of the reign. The obverse formula records COS without an iteration, placing the issue after his assumption of the consulship on July 1, AD 37. Because Gaius received his second grant of tribunician power (TR POT II) in early 38 and entered his second consulship (COS II) on January 1, AD 39, numismatists date this specific type securely between July AD 37 and early AD 38. The type belongs to an interconnected triad of dynastic reverse types introduced simultaneously at the start of the reign. In parallel with this Divus Augustus issue, the mint struck denarii and aurei depicting Gaius's deceased mother, Agrippina the Elder (RIC 7 for the denarius), and his father, Germanicus (RIC 11 for the denarius). Gold aurei were struck using identical reverse and obverse dies or identical typological compositions, with RIC 1 functioning as the gold counterpart to RIC 2. Subsequent issues in AD 38 and AD 40 retained similar iconographic themes but updated the epigraphic formulae to include successive iterations of his offices (such as TR POT II and TR POT III). Consequently, RIC 2 represents the inaugural silver iteration of this celestial Augustan design, struck before administrative and political relations between Gaius and the senatorial aristocracy deteriorated later in his reign.

Circulation, Hoard Contexts, and Survival

Denarii of Gaius circulated widely throughout the Mediterranean world, but their overall survival rate is markedly lower than the denarii of Augustus or the plentiful 'Tribute Penny' issues of Tiberius. Gaius's reign lasted less than four years (AD 37 to 41), resulting in an intrinsically smaller total volume of minted silver than the multi-decade reigns of his predecessors. Following Gaius's assassination in January AD 41, the Senate condemned his memory. While formal damnatio memoriae did not involve a systematic demonetization of his silver coinage, large volumes of his currency were steadily retired from circulation during the reigns of Claudius and Nero. His denarii were routinely melted down and restruck into new coin types, partly due to political repudiation and partly because of natural fiscal recycling. Despite this attrition, specimens of RIC 2 survived in several notable Julio-Claudian hoards across Italy, Gaul, and the Rhine frontier, such as the hoard evidence documented from early military camps where soldiers received their payments in mixed Augustan and Caligulan silver. Due to their relatively brief production run and subsequent melting, genuine specimens of RIC 2 are today among the scarcer early imperial denarii. Many surviving examples display moderate to heavy wear, indicating that those coins escaping official withdrawal remained in active circulation alongside Tiberian and Claudian denarii until the major monetary reform and debasement carried out under Nero in AD 64.

References

1. Coinage in the Roman World. pp. 66-78
2. Online Coins of the Roman Empire: RIC I (second edition) Gaius/Caligula 2. ric.1(2).gai.2
3. The Roman Imperial Coinage, Volume I: From 31 BC to AD 69. pp. 104-109, no. 2
4. Nummi Signati: Untersuchungen zur romischen Munzpragung und Geldwirtschaft. pp. 85-98