Rome had a problem it never fully solved. It had a rival.
Not a tribe across the Rhine, not a pirate fleet in the Mediterranean, not a rebellious province. A rival empire, organised, literate, militarily sophisticated, economically self-sufficient, and sitting directly astride the Silk Road, that Rome fought for over six centuries and never conquered. Most popular histories of the ancient world leave Persia in the footnotes, a recurring enemy that Rome periodically clashed with before returning to more interesting business. The coins tell a different story. Two in this collection, the Vologases III “Silk Road Sovereign” Drachm (Sellwood 78.2) and the Khusro II Silver Drachm (AD 590–628) , let you hold both ends of that story in your hand, separated by four and a half centuries, minted by two different Persian dynasties, but carrying the same message: there is another great power, and you are looking at its money.
Two Empires, One Frontier
The eastern frontier was Rome’s permanent obsession. Armenia was the hinge, a buffer kingdom both sides claimed, fought over, installed puppet kings in, and invaded repeatedly for five hundred years. Behind Armenia lay Mesopotamia, the wealthiest agricultural land in the ancient world, and behind Mesopotamia lay Persia itself, the heartland of two successive empires that Rome never managed to hold for more than a campaign season.
The Parthians came first. The Arsacid dynasty rose to power in the third century BC, filling the vacuum left by Alexander the Great’s conquests and building an empire that stretched at its peak from the Euphrates to the borders of India. Rome encountered them seriously for the first time in 53 BC, when the general Crassus, one third of Caesar’s First Triumvirate, the richest man in Rome, marched seven legions east and was annihilated at Carrhae by Parthian horse archers and heavy cavalry cataphracts. Twenty thousand Romans died. The eagles of seven legions were captured. It was one of Rome’s worst military disasters, and it happened not to a barbarian horde but to a state with a professional army, an organised command structure, and a flair for the kind of psychological warfare that comes from knowing your enemy wants your land.
The Sasanians replaced the Parthians in AD 224, when Ardashir I overthrew the last Arsacid king and founded a new Persian dynasty more aggressively centralised, more religiously unified under Zoroastrianism, and more militarily ambitious than its predecessor. The wars between Rome and the Sasanians produced some of the most dramatic moments in late Roman history: Shapur I capturing the Roman emperor Valerian alive in 260, the only Roman emperor ever taken prisoner in battle and keeping him as a footstool. Julian the Apostate dying of a spear wound on a Persian campaign in 363, the army he led into Sasanian territory turned back by supply failures and scorched earth, his famous pagan restoration experiment dying with him on the far bank of the Tigris. Our own Julian II Maiorina, the Bull coin, the last pagan coin type Rome ever struck, was minted in the same year his fatal Persian campaign ended. The two stories are inseparable.
The Vologases III Drachm: Philhellene King, Pragmatic Survivor
Pick up the Vologases III drachm and the first thing you notice is the legend on the reverse. It’s in Greek. On a Persian coin. In the second century AD.
The Arsacid Parthians were heirs to the Hellenistic world Alexander the Great had built, and they maintained Greek as a prestige language on their coinage even as the spoken language at court had long since shifted back to Iranian. The full reverse legend reads ΒΑΣΙΛΕΩΣ ΒΑΣΙΛΕΩΝ ΑΡΣΑΚΟΥ ΟΛΑΓΑΣΟΥ ΔΙΚΑΙΟΥ ΕΠΙΦΑΝΟΥΣ ΦΙΛΕΛΛΗΝΟΣ — “King of Kings Arsaces Vologases, the Just, the Illustrious, the Friend of the Greeks” and it tells you everything about what Parthian imperial identity was: a deliberate fusion of Iranian royal tradition (King of Kings, the ancient Persian title) with Greek cultural prestige (Philhellene, lover of Greek culture), all dressed in the image of Arsaces I, the dynasty’s semi-mythical founder, shown seated on the reverse holding his bow.
Vologases III himself — whose reign stretched from roughly AD 105 to 147 — is a quietly fascinating figure. He came to power during the chaotic final years of his father Pacorus II, spent decades fighting a civil war against the rival claimant Osroes I, and had to navigate the most dangerous Roman military operation into Parthian territory since Crassus: Trajan’s great eastern campaign of AD 114–117, which temporarily seized Armenia, Mesopotamia, and even the Parthian capital of Ctesiphon. Vologases’s eastern domains were largely untouched by Trajan’s advance, which focused on Osroes’s western holdings and when Trajan died in 117 and his successor Hadrian pulled all Roman forces back across the Euphrates, Vologases III was well-positioned to reunite Parthia. His coinage is the most prolific of any Parthian king precisely because his reunified, stable, trade-rich reign was the Parthian high-water mark.
Trajan’s campaigns are exactly when Antoninus Pius came of age — Antoninus whose long peaceful reign came after Trajan and Hadrian’s managed retreat made the eastern frontier, once again, an uneasy truce. Numismatically speaking, Vologases III’s prolific silver was circulating at the same time as Antoninus’s Antoniniani were the backbone of Roman commerce, two monetary systems, two empires, same moment in history. For context on how Rome’s own monetary denominations structured that commerce, the history of Roman coin denominations is the natural companion piece.
The Khusro II Drachm: The Last Great King and the Coin Before the Storm
Four and a half centuries after Vologases III, the Khusro II Silver Drachm represents a completely different world. The Greek legend is gone, replaced entirely by Pahlavi, Middle Persian script, flowing and cursive, unreadable to most modern eyes but carrying a clear message to anyone in the Sasanian sphere in the early seventh century. The portrait on the obverse isn’t the bearded profile of a Hellenistic-influenced king. It’s Khusro II facing right in his distinctive winged crown, surrounded by a crescent and star in each quadrant. The reverse carries the image that defines Sasanian coinage from beginning to end: a Zoroastrian fire altar, the sacred flame burning between two attendants, with the regnal year on the left and the mint abbreviation on the right.
Khusro II “the Victorious” (also called Khosrow Parviz — Khosrow the Conqueror) is the most dramatic figure in Persian history. He began his reign in chaos, overthrown and in exile, restored to the Sasanian throne in 591 with direct military assistance from the Byzantine emperor Maurice. He repaid that personal debt by remaining at peace with Byzantium for over a decade and when Maurice was overthrown and murdered by the usurper Phocas in 602, Khusro used the assassination as his pretext for war.
What followed was the greatest Persian military expansion since Cyrus the Great. Sasanian armies swept through Byzantine Syria, Palestine, and Egypt. In 615, Persian forces captured Jerusalem, seizing the True Cross, the most sacred relic in Christendom — and carrying it back to Ctesiphon. By 626, Sasanian forces had reached the walls of Constantinople itself.
But Khusro had overextended catastrophically, and the Byzantine emperor Heraclius launched a stunning counter-offensive that reversed every Persian gain. Khusro was overthrown and murdered by his own son in 628. The Sasanian Empire, exhausted by thirty years of total war, never recovered. Within two decades it had collapsed entirely under the Arab Muslim conquests, the exact conquests that produced our Hisham ibn Abd al-Malik Umayyad Dirham a century later. The Islamic silver dirham that replaced Sasanian coinage across the former Persian heartland didn’t emerge from nowhere: it directly inherited the Sasanian drachm’s weight standard, its silver purity, and its circular format, before stripping the royal portrait and replacing it with Quranic text. The drachm in the collection is, in a very real sense, the grandfather of that dirham.
Two Coins, Two Scripts, One Continuous Thread
Set the two Persian coins side by side and the six-century arc becomes visible. The Vologases III drachm carries Greek because Parthia still needed to speak to a Hellenistic world. The Khusro II drachm speaks only Pahlavi because the Sasanians had made Zoroastrian Persian civilisation confident enough to require no external cultural validation. The obverse portrait shifts from a diademed profile, consciously Hellenistic in posture, to a full frontal crowned image of near-divine kingship, the fire altar replacing the seated archer as the reverse type.
What stays constant across both coins is the weight. The Parthian drachm and the Sasanian drachm are both approximately 3.7–4.0 grams of silver, slightly smaller than a Roman denarius but close enough that they were the accepted silver standard from the Euphrates to the Indus for six centuries. When Roman merchants traded overland on the Silk Road, they dealt in a world where these coins circulated alongside Roman silver, two monetary systems in negotiation, just like the empires that struck them. Our own mint marks guide shows how Roman mints stamped their geographic identity into bronze and silver; the Sasanians did exactly the same with their two-letter Pahlavi mint abbreviations on the reverse exergue of every drachm. Different scripts, same impulse: this coin was made here, by us, and carries our authority.
Rome never conquered Persia. Persia never conquered Rome. What they did instead was define each other across six centuries, militarily, commercially, and culturally, until both of them were swept away by forces neither had anticipated. The two coins in this collection are the most direct evidence of that relationship this side of a museum vitrine.
For the broader context of the late Roman denominations circulating alongside Parthian drachms, see A History of Roman Coin Denominations. And for the empire that ultimately inherited both the Sasanian monetary tradition and Rome’s eastern provinces, the Andronikos II Basilikon shows where that thousand-year thread finally ended.
