Chalcedon
Chalcedon ( or ;
, sometimes transliterated as "Chalkedon") was an ancient maritime town of Bithynia, in Asia Minor. It was located almost directly opposite Byzantium, south of Scutari (modern Üsküdar) and it is now a district of the city of Istanbul named Kadıköy. The name "Chalcedon" is a variant of Calchedon, found on all the coins of the town as well as in manuscripts of Herodotus's "Histories", Xenophon's "Hellenica", Arrian's "Anabasis", and other works. Except for a tower, almost no above-ground vestiges of the ancient city survive in Kadıköy today; artifacts uncovered at Altıyol and other excavation sites are on display at the Istanbul Archaeological Museum.
Ecthesis
By the beginning of the 7th century, the court and the religious hierarchy at Constantinople were by and large firmly in the Chalcedonian camp. However, this put them at odds with the majority Non-Chalcedonians in Egypt, Syria, Mesopotamia and Armenia. Such a division was dangerous in an empire that was under threat from the Persian Sassanids, especially as the Non-Chalcedonians considered their schismatic brethren to be more of a threat than any foreign invader. Consequently, the emperors at Constantinople were always seeking some method of rapprochement to heal the breach in the church, and thereby prevent the empire’s enemies from taking advantage of the internal divisions.