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The life arc of Constantine (ca. 272 – 337 AD) is one of the most dynamic in all of ancient Roman history, and that is saying something. Not coincidentally, the coinage during this period manifests a veritable Cambrian explosion of design, variety, and innovation. Prior to Constantine's surge up the imperial ladder, Diocletian’s Tetrarchy had intentionally homogenized Roman currency, resulting in rigid and uniform numismatic output designed to project a monolithic state. After Constantine’s dynasty faded, imperial coinage largely stagnated once again into predictable, repetitive types. In between saw a Roman numismatic renaissance that reflected the constant flux of Constantine’s world.
During Constantine's long reign, the blocky, militaristic portraits of the Tetrarchs gave way to different styles, including idealized, upward-gazing profiles. Traditional pagan deities were systematically replaced by his personal protector, Sol Invictus, and eventually by groundbreaking Christian motifs like the Chi-Rho. Entirely new denominations were introduced, alongside massive commemorative issues celebrating newly founded capital cities. Highly fascinating is the radical metallurgical experimentation of the era. When pure silver argentei collapsed under inflation, Constantine's mints innovated with the "pseudo-argenteus", billon coins struck with a premium silver alloy and exquisite, high-crested helmeted portraits to mimic true silver.
For the modern ancient coin collector, this landscape provides an incredibly rich, varied, and exciting frontier to explore. Even Constantine's reign itself was highly diverse, broken into at least nine distinct segments, each featuring a unique imperial title, shifting territorial boundaries, and an ever-evolving array of co-rulers (not even counting unofficial issues; see the first coin in this series struck by Maxentius). This gallery page and the one following provide some seminal examples of this diversity. Herein, Constantine is represented by no fewer than nine coins, but even that count can only provide a small glimpse of the total ancient numismatic palette.
One of the most fascinating opportunities for ancient coin enthusiasts arises from the Conference of Carnuntum in late 308 AD. With the Tetrarchy fracturing under the weight of rival claimants, past and present senior Roman Emperors met to broker a settlement. Even before this conference, Constantine’s numismatic identity had already evolved through a plethora of different titles. Following his father's death in 306 AD, his loyal troops immediately proclaimed him a Western Augustus. Recognizing the danger of an open usurpation, the senior Augustus, Galerius, intervened, demoting Constantine but officially recognizing him as a Western Caesar. Yet, when political anarchy consumed the West the following year, Constantine took his chance to upgrade his status once again, accepting the title of Augustus from the rebel Maximian. Technically, this made Constantine a "self-proclaimed" Augustus and a usurper in the eyes of the Eastern court. With the Tetrarchal system in total freefall, the Carnuntum summit was called to restore order.
Constantine fully anticipated that this summit would formally legitimize his status as a full Augustus. Instead, he was dealt a bitter snub: the senior emperors passed over him entirely, assigning the Western Augustus throne to Licinius — a political insider who had never even served a day as a junior Caesar. Furious at this subversion, Constantine flatly refused to acknowledge Licinius’s seniority. Facing an immediate civil war, Galerius engineered an unprecedented semantic compromise, creating the unique, awkward constitutional tier of FILIVS AVGVSTORVM ("Son of the Augusti").
This well-preserved nummus provides an example of coinage for the period wherein Constantine carried his most eclectic imperial title. Struck at the central mint of Siscia (modern-day Sisak, Croatia), this issue carries immense geopolitical weight. Siscia was located firmly within the territorial jurisdiction of Constantine’s direct rival, Licinius. The obverse features a classic laureate bust of the prince, bounded by the ephemeral epigraphy of CONSTANTINVS FIL AVGG. The reverse marks a critical ideological transition away from the traditional Genio Populi Romani type, opting instead for GENIO AVGVSTI ("To the Genius of the Emperor"), a deliberate theological homage to the divine protective spirit of the ruling monarchs.
By 310 AD, Constantine had cast the meaningless title of
Filius Augustorum aside, his ever-shifting ambitions propelling the Empire back into open warfare. It is no wonder that surviving examples of coins such as this one are highly sought after as rarities. But even Constantine's common coins offer a cornucopia for today's collectors. Ultimately, the stunning transformation of Roman coinage during his reign — a plethora of titles, designs, denominations, metals, and more — is a fitting legacy of the juggernaut who fundamentally rewrote the Roman world.
Additional Reading: V Clark, Constantine the Great: The Coins Speak, MA Thesis, Middle Tenneessee State University, 2009.
Coin Details: ROMAN EMPIRE, Constantine I, as Filius Augustorum, AD 309-310, BI Reduced Nummus (24.5mm, 6.82 g, 12h), Siscia mint, 1st officina, NGC Grade: AU, Strike: 4/5, Surface: 4/5, Obverse: Laureate head right, CONSTANTINVS FIL AVGG, Reverse: Genius standing left, holding patera and cornucopia, upturned crescent to left, GENIO A- VGVSTI, A to right, SIS in exergue, References: RIC VI 200b; S 15581 (this coin illustrated).
Image: Sony ɑ 7R Ⅴ camera / Sony FE 90mm 2.8/100 Macro GM lens.