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.
Leo of Chalcedon
Leo of Chalcedon was an 11th-century Eastern Orthodox bishop of Chalcedon who opposed the appropriation of church treasures by Byzantine emperor Alexios I Komnenos between 1081 and 1091.