Astakos

Astakos was an important port city located in the ancient region of Bithynia, at the eastern end of the modern Gulf of Izmit. Founded by Megarian colonists in the 7th century BCE, it played a key role in maritime trade thanks to its strategic location. The city experienced a historical turning point, especially during the Hellenistic Period with the rise of the Bithynian Kingdom, serving as the precursor to Nicomedia and demonstrating its economic power by minting its own coinage.

History

The ancient city of Astakos was founded by Megarian colonists towards the end of the 7th century BCE. As one of the oldest Greek colonies in the Bithynian region, it quickly became an important trade center. With the expansion of the Persian Empire into Anatolia, Astakos fell under Persian rule and lost its independence for a period. However, in the 5th century BCE, it regained importance as a member of the Delian League and held a strategic position in the struggle against the Persians. Entering the Hellenistic Period after the conquests of Alexander the Great, the city changed hands among various Hellenistic kingdoms. One of the most significant turning points in its history was its refoundation by King Nicomedes I of Bithynia in the early 3rd century BCE, when it was renamed Nicomedia. This refoundation not only changed the city's name but also increased its regional importance and political weight. With the expansion of the Roman Empire into Anatolia, Astakos/Nicomedia continued its existence as one of the important cities of the Roman province of Asia and later of the province of Bithynia and Pontus.

Geographic Location

Geographically, Astakos was situated at the eastern end of the Gulf of Izmit (ancient Gulf of Astakos) in present-day Kocaeli province, directly on the sea. This strategic location provided the city with a unique advantage on the maritime trade routes between the Sea of Marmara and the Black Sea. The city also served as a gateway to the fertile lands of Bithynia, enabling the marketing of agricultural riches (such as grain and timber) from its hinterland to the Mediterranean world by sea. Its possession of a natural harbor allowed ships to anchor safely and conduct loading and unloading operations. Neighboring cities included Olbia (later known as Libyssa) on the opposite shore of the Gulf of Izmit, and other important settlements in the interior. This location made Astakos a critical center in the ancient world for both defense and trade.

Significance in Antiquity

Ancient Astakos held great significance for its region from economic, political, and potentially religious perspectives. Economically, as a port city opening to the Sea of Marmara, it served as a bridge in the trade network between the Black Sea and the Aegean. It played a key role in the export of grain, timber, fish, and other regional products, and was also an important center for the distribution of goods from other regions into the Bithynian interior. Politically, it maintained its existence as an independent polis (city-state) from its foundation, subsequently becoming a strategic base for the Persian Empire and the Delian League. With the rise of the Bithynian Kingdom during the Hellenistic Period, especially after its refoundation by Nicomedes I and renaming as Nicomedia, it assumed a central role in regional politics and became the capital of the kingdom. Religiously, although direct and comprehensive archaeological evidence regarding the deities worshipped in the city is limited, it can be assumed that temples and places of worship dedicated to the gods of the Greek pantheon (especially sea-related deities like Poseidon) and local cults specific to the region existed.

Coinage

Astakos was one of the important cities in antiquity that possessed the privilege of minting its own coinage, a strong indicator of the city's economic independence and political autonomy. The city's early coins began to be struck from the late 5th century BCE onwards. These coins typically featured on the obverse symbols of Megara, its founder, such as the murex shell, or figures symbolizing the city's strong connection to the sea, such as fish, dolphins, or mythological figures like the sea god Poseidon. The reverse usually bore monograms or full inscriptions, such as "AΣ", "AΣTA", or "AΣTAKOΣ", abbreviations of the city's name.

During the Hellenistic Period, especially when it came under the influence of the Bithynian Kingdom and was subsequently refounded as Nicomedia by Nicomedes I, direct coinage by Astakos itself diminished or ceased in favor of royal issues; however, coinage was again struck by local authorities during the Roman Imperial period. On these Roman Imperial bronze coins, portraits of the reigning emperors appeared on the obverse, while the reverse depicted local symbols of Astakos or Nicomedia, figures of deities, architectural structures, or mythological scenes related to the city. These coins are valuable archaeological and numismatic evidence reflecting Astakos's role in regional commercial activities, its economic power, and its cultural identity.

Archaeological Remains

Today, the archaeological remains of the ancient city of Astakos are quite limited and largely lie beneath the modern city of Izmit. Centuries of settlement activity in the city and the extensive reuse or destruction of ancient structures during the construction of Nicomedia have resulted in the scarcity of prominent remains surviving to the present day. During surface surveys and limited rescue excavations, some ceramic fragments, architectural elements, foundation remains, and tomb finds have been identified. However, these remains are not extensive enough to reveal the city's overall plan or its important public buildings, temples, or theater. There are clues regarding the city's harbor structure and some findings related to its necropolis (cemetery) areas. Most remains are either buried under modern development or were used as building materials during the construction of Nicomedia, making it difficult to trace the vestiges of Astakos.

Today

The ancient city of Astakos is located today within the boundaries of the Izmit district, part of Kocaeli province in Turkey. Due to its location beneath the modern city of Izmit, there is no distinct and visitable archaeological site or park belonging to the ancient city. Access to the region is quite easy by road (especially the O-4 and D-100 highways) and by rail. Although it is a frequently visited region due to its proximity to Istanbul, there is no specific archaeological area for those wishing to directly visit ancient Astakos; remains are generally scattered beneath or within modern structures.