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.
History of Christian theology
While the Western Roman Empire declined and fell, the Eastern Roman Empire, centred on Constantinople, remained standing until 1453, and was the home of a wide range of theological activity that was seen as standing in strong continuity with the theology of the Patristic period; indeed the division between Patristic and Byzantine theology would not be recognised by many Orthodox theologians and historians.The Council of Chalcedon was an ecumenical council that took place from October 8 to November 1, 451, at Chalcedon (a city of Bithynia in Asia Minor).