The history of the city of Ordu is rooted in deep antiquity. The first known settlement on the territory of modern Ordu, Cotyora, was founded in the 8th century BC by Greek colonists from the city of Sinop. This ancient polis is mentioned in the famous work of the ancient Greek historian Xenophon, "Anabasis". It recounts how ten thousand Greek mercenaries stayed in Cotyora for 45 days in 401 BC during their retreat from Persia.
Key factors in the city's establishment were its advantageous geographical position and trade. Its location on the Black Sea coast in a sheltered bay made Cotyora, and later Ordu, a strategically important trading point and port. The city was involved in maritime trade, and the surrounding lands were known for their resources; in particular, the local Chalybes tribes were famous for their skill in mining and processing iron.
Throughout its long history, the city was part of the Kingdom of Pontus, and the Roman and Byzantine Empires. Around 180 BC, the inhabitants of Cotyora were resettled by King Pharnaces I to the new city of Pharnacia. In the Middle Ages, the region passed under the control of Turkish beyliks, and later, in the 15th century, became part of the Ottoman Empire, receiving its modern name Ordu, which translates to "army".
Initially, Cotyora was a small Greek colony with a characteristic Hellenic culture, and its economy was closely linked to the sea — fishing and trade. After becoming part of the Ottoman Empire, the city remained a small settlement for a long time, inhabited predominantly by Pontic Greeks. Its active growth and development began significantly later, but the historical heritage of ancient Cotyora remains an important part of Ordu's identity to this day.