Prehistory
The mound of Fikirtepe has yielded remains dating to the Chalcolithic period (5500-3500 BC) and attest to a continuous settlement since prehistoric times. Phoenicians were active traders in this area.
Pliny states that Chalcedon was first named Procerastis, a name which may be derived from a point of land near it: then it was named Colpusa, from the form of the harbour probably; and finally Caecorum Oppidum, or the town of the blind.
Read more about this topic: Chalcedon