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.
Chalcedon Foundation
The Chalcedon Foundation is an American Christian Reconstructionist organization founded by Rousas John Rushdoony in 1965. Named for the Council of Chalcedon, it has also included theologians such as Gary North, who later founded his own organization, the Institute for Christian Economics.