Trikomia was an ancient settlement located on important trade routes of ancient Anatolia, within the Propontis (Sea of Marmara) region. Its strategic geography, controlling maritime trade between the Mediterranean and the Black Sea, allowed many Hellenic colonies in the region to prosper through maritime commerce. This ancient city, situated within the borders of modern Turkey, is considered a part of the historical landscape of Propontis.

History

While definite information regarding the foundation of Trikomia is limited, it is believed to have emerged during or after the Hellenic colonization movements that began in the 8th and 7th centuries BCE, similar to many other cities in the Propontis region. The area was particularly rich in colonies established by Hellenic city-states such as Miletus and Megara, founded for the purpose of controlling the Black Sea trade route and exploiting agricultural resources. Trikomia can thus be assumed to have been a small settlement that developed as part of this general wave of colonization, perhaps within the sphere of influence of a larger metropolis (e.g., Astacus or Nicomedia). During the period of the Persian Empire's dominance in Anatolia, the region frequently became a battleground due to its strategic importance. Following Alexander the Great's conquests, it came under the control of Hellenistic kingdoms, particularly the Kingdom of Bithynia. Trikomia appears to have continued its existence during the Roman Empire, integrating into Rome's administrative and economic structure in the region. It later retained its importance as part of the Byzantine Empire, but specific historical records concerning the city are quite scarce.

Geographic Location

Trikomia was situated on the southern coast of Propontis (Sea of Marmara), at coordinates 40.960845 latitude and 30.032644 longitude. This location, corresponding to the vicinity of Başiskele or Gölcük districts in Kocaeli province within modern Turkey, ensured that it was an important stop or a settlement close to the vital maritime trade route between the Mediterranean and the Black Sea in antiquity. Propontis held strategic importance for both maritime trade and its connections with inland regions. The exact location of Trikomia, as indicated by the BAtlas 52 G3 reference, must have been somewhere on the southern shores of the Gulf of Izmit (ancient Gulf of Astacus). This geographic position may have allowed the city to integrate into regional trade networks, in addition to its agricultural or fishing activities. Important centers in its close vicinity included Astacus, Nicomedia, and Nicaea.

Significance in Antiquity

The significance of ancient Trikomia likely stems from the general strategic and economic context of the Propontis region. The region was in a key position for controlling trade between the Mediterranean and the Black Sea; this led to the prosperity of the surrounding Hellenic colonies through maritime trade. Although Trikomia was not directly a major metropolis, it may have served as part of this trade network. The city might have functioned as a small port where ships called, a center for collecting and distributing regional agricultural products, or a settlement supplying larger cities nearby. Propontis played a significant role in the transport of goods such as grain, fish, and timber from the Black Sea to the Mediterranean. Trikomia's place within this general economic cycle may have contributed to the development of its local economy and affected the prosperity of the region's inhabitants. Politically, it was likely under the administrative and military control of stronger city-states or empires (Bithynia, Rome, Byzantium) in its vicinity.

Coinage

No coins from this settlement are recorded in the NumisTR database. While large and economically powerful cities typically held the privilege of minting their own coins, smaller settlements like Trikomia may have used the coinage of larger metropolises in the vicinity (e.g., Nicomedia, Nicaea, or Prusa) for their trade. This indicates that its economic activities were integrated with regional markets, but its political and economic independence had not developed sufficiently to necessitate its own coinage. In such settlements, a barter economy or the standard coinage of neighboring cities was commonly used in daily commerce.

Archaeological Remains

Detailed information regarding significant archaeological remains of Trikomia surviving to the present day is unavailable. Like many small ancient settlements in the region, the remains of Trikomia either lie beneath modern settlements, have succumbed to natural erosion, or have not yet been subject to comprehensive archaeological investigations. Surface surveys or fortuitous finds may have identified pottery fragments, foundation traces, or other minor architectural elements. However, large-scale structures or monumental remains have not been reported. This suggests that the city likely had a more modest structure or has been completely obliterated over time. Future systematic archaeological excavations may provide more information about Trikomia's ancient structure and way of life.

Today

The ancient settlement area of Trikomia is located within the borders of modern Turkey, corresponding to the vicinity of Başiskele or Gölcük districts in Kocaeli province. The coordinates 40.960845, 30.032644 indicate an area located on the southern coast of the Gulf of Izmit. Today, these areas are generally used as agricultural lands, residential areas, or industrial zones. The ancient city can be accessed via modern highways and transportation networks, but there is no dedicated ancient site arrangement or museum for visitors.