» For the Ecumenical Council of 451, see Council of Chalcedon; For the religious/political organization, see Chalcedon Foundation. Chalcedon (modern English pronunciation /kælˈsiːdən/ or /ˈkælsᵻˌdɒn/;, sometimes transliterated as Chalkedon) was an ancient maritime town of Bithynia, in Asia Minor, almost directly opposite Byzantium, south of Scutari (modern Üsküdar). Today, in modern Turkish, Chalcedon's called Kadıköy, and's a di… (More on Chalcedon)