Istros

Topography and History

Istros — known in antiquity also as Histria or Istropolis (Ancient Greek: Ἰστρίη) — was one of the earliest Greek colonial foundations on the western shore of the Black Sea. Milesian settlers established it in the 7th century BC, taking advantage of a natural gulf that offered sheltered anchorage and proximity to the great river the Greeks called the Ister (the Danube), whose course has since shifted so that its banks now lie some 70 km away. The site is located in what is today the Dobruja region of Romania, near the modern village of Istria.

The city originally occupied a low-lying peninsula, its landward side bordered by marshy terrain. A northern bay and a southern bay framed the settlement, with the southern inlet most likely functioning as the main harbour. The acropolis crowned the highest ground overlooking the sea, while the residential quarters of the Archaic period extended roughly 800 metres further inland to the west.

Over the centuries, sediment carried by the Danube gradually closed off the open coastline, transforming the surrounding waters into a lagoon. Today this lagoon is known as Lake Sinoe, and portions of the ancient city now lie beneath its surface. What was once a thriving maritime city has become a landlocked archaeological site. Covering approximately 82 hectares, Istros remained inhabited for well over a millennium — passing through Greek Archaic, Classical, Hellenistic, and then Roman phases — before being abandoned in the early 7th century AD in the face of repeated incursions and accelerating environmental change.

Minting System and Typology

The coinage of Istros reflects the city's long commercial life and passes through several distinct phases. In its earliest period, the 7th and 6th centuries BC, the city used cast bronze arrowheads — sometimes stamped with a wheel symbol or the abbreviation ΙΣΤ — as a form of proto-currency, alongside similarly marked wheel-shaped bronzes.

Struck silver coinage began in the 5th century BC, following the Attic weight standard. Drachms and didrachms carried what became the city's signature types: on the reverse, an eagle seizing a dolphin — widely interpreted as an emblem of Greek dominance over the Black Sea and its trade — and on the obverse, the design for which Istros is most celebrated today: two male heads placed side by side, one upright and one inverted. Unique in the entire ancient world, this motif has resisted definitive interpretation. Scholars have variously identified the figures as the Dioscuri, solar deities, the two mouths of the Danube, or — in a more recent proposal — the mythological sons of the river god Istros. The type remained in use, largely unchanged, from the late 5th century to approximately 300 BC.

In the Hellenistic period silver output declined, giving way first to a brief gold coinage and then to autonomous bronze issues bearing divine imagery such as the river god Istros and the goddess Demeter. Under Roman rule from the 1st century AD, the city participated in the provincial bronze coinage system. The wide distribution of Istrian silver drachms — found across Dobrudja and into Wallachia and Moldavia — speaks to the city's sustained importance as a regional trading centre.