Chalcedon
The site of Chalcedon is located on a small peninsula on the north coast of the Sea of Marmara, near the mouth of the Bosphorus. A stream, called the Chalcis or Chalcedon in antiquity and now known as the Kurbağalıdere (Turkish: "stream with frogs"), flows into Fenerbahçe bay. There Greek colonists from Megara in Attica founded the settlement of Chalcedon in 685 BC, some seventeen years before Byzantium.
Tychicus of Chalcedon
Tychicus of Chalcedon was a figure in early Christianity. Tradition holds that he was bishop of Chalcedon in the 1st century CE, and he is sometimes numbered among the Seventy Disciples. Little else is known about him.