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.
Canonical territory
In the middle of the 5th century, a number of Eastern Churches rejected the Council of Chalcedon of 451 thus creating a schism which led to the rise of "parallel hierarchies". Those who accepted the 451 Council of Chalcedon similarly classified those who rejected it as Monophysite heretics. The Churches that refused to accept the Council considered instead that it was they who were orthodox. The six present-day Churches that continue their tradition reject the description "Monophysite", preferring instead "Miaphysite". They are often called, in English, "Oriental Orthodox Churches", to distinguish them from the Eastern Orthodox Churches. These churches are also referred to as "pre-Chalcedonian" or, now more rarely, as "non-Chalcedonian" or "anti-Chalcedonian".