Roman Dupondius: The "Double Pound" Coin Explained

Illustrated Specimen Details: Copper Dupondius of Tyras

Example Specimen: Dupondius, 211-217 AD (Tyras / Roman Empire)

Authority & Identification: This coin was issued by the city of Tyras, an ancient Greek settlement on the northern coast of the Black Sea (modern-day Bilhorod-Dnistrovskyi in the Odesa Oblast of Ukraine). Although founded by colonists from Miletus around 600 BC, by the time this coin was minted, Tyras was under the total influence of the Roman Empire. The obverse features the portrait of Marcus Aurelius Antoninus (commonly known as Caracalla), the Roman emperor from 198 to 217 AD and a member of the Severan dynasty. The approximate legend reads "M AYPH ANTΩNINO". The reverse displays an eagle with a wreath in its beak, accompanied by the inscription "TYPANΩN" (indicating the city of Tyras) and an inclined letter "B" above the eagle, likely denoting the denomination from the term "Binarius" (meaning double, or consisting of two parts).

Numismatic Controversies: This intriguing coin raises several historical and numismatic questions. First, its regional classification is debated. While Tyras was a Greek settlement, it operated under Roman influence and was geographically situated on the outskirts of Scythia (specifically Sarmatia). Consequently, various catalogs assign this coin to three different sections: the Roman Empire, Ancient Greece, or Scythia. Second, the denomination itself is disputed. The absolute majority of Roman bronze dupondii weighed significantly more than 10 grams, whereas this specimen is roughly three times lighter (3.68 g). Despite this, many regional sources identify it as a dupondius, though some alternative classifications label it as AE17, AE21, or even a diassarion. Finally, there is a mystery regarding the ruler's identity. Catalogs list two nearly identical coins — one of Caracalla and one of his brother and co-ruler, Publius Septimius Geta (209-211 AD). Given the poor condition of most surviving specimens, they can only be distinguished by the obverse legend, leading to frequent misidentifications across different numismatic references.

1. ANCIENT ROME (3rd century BC — 3rd century AD): ROMAN REPUBLIC + ROMAN EMPIRE + ROMAN PROVINCES: dupondius = 2 as

DUPONDIUS as a coin name has a fascinating and somewhat unexpected etymology. It is quite common to find sources stating that the dupondius is a Roman coin worth two asses, deriving from the Latin "dupondius" — meaning "two-pounder". But how do asses and pounds relate? The explanation lies in the origins of the Roman monetary system. The earliest ancient as had a standard weight of exactly 1 Roman libra. Over time, the unit of weight measurement (the libra) was linguistically transformed through the expression "lībra pondō" (meaning "the weight measured in libra") into a simplified new term — the pound. Therefore, the coin name dupondius perfectly reflects its most ancient, fundamental essence: a solid weight equal to 2 libras, 2 pounds, or 2 asses.

History and Evolution of the Dupondius

Origins and Monetary System

The dupondius was a cornerstone of the classical Roman monetary system, serving as an important bronze (and later brass) denomination from the 3rd century BC until its decline in the 3rd century AD. In the established Imperial system, one dupondius was equal to two asses, while two dupondii equaled one sestertius. Following the monetary reforms of the early Empire, eight dupondii made up one silver denarius. The denomination first emerged during the Roman Republic as a large, heavy cast bronze coin known as "aes grave". Following the sweeping monetary reforms of Augustus around 23 BC, it became a standard, highly regulated component of the imperial coinage system. Occupying a crucial middle position between the low-value as and the higher-value sestertius, the dupondius became the essential everyday money for urban commerce, market exchanges, and military payments.

Physical Characteristics and Issuers

From the reign of Augustus onward, most imperial dupondii were intentionally struck in orichalcum, a golden-colored brass alloy, while the lower-value as was typically struck in reddish copper. This distinct color difference helped the Roman public easily distinguish between the two denominations in daily trade. A further visual aid was introduced beginning with the reign of Nero: many dupondii began to portray the emperor wearing a radiate crown, which became the standard symbol identifying a coin as a double unit (worth two asses). A vast array of emperors issued this denomination, including Augustus, Tiberius, Caligula, Claudius, Nero, Vespasian, Trajan, Hadrian, Antoninus Pius, and Marcus Aurelius. These coins frequently featured elaborate reverse designs showcasing Roman deities, impressive military trophies, magnificent temples, and elegant personifications of virtues and provinces.

Decline and Numismatic Legacy

The relevance of the dupondius began to wane during the severe monetary crises of the 3rd century AD. Rampant inflation and aggressive currency debasement fundamentally undermined the importance of traditional bronze and brass denominations, leading to the gradual disappearance of the dupondius as newer coin types replaced the classical Roman monetary structure. Today, dupondii remain among the most common and historically significant large bronze coins of the Roman Empire available to collectors. Numismatists particularly prize early Augustan issues, rare provincial reverse types, and exceptionally well-preserved brass examples that still retain their original golden surfaces. The coin stands as a prime linguistic and historical example of Roman numerical coin naming, reflecting the strict mathematical relationships that governed the ancient economy.

▶