'''Chalcedon''', (modern English pronunciation /kælˈsiːdən/ or /ˈkælsᵻˌdɒn/; Greek: Χαλκηδών), <ref>[http://dictionary.reference.com/browse/chalcedon "Chalcedon"]. Dictionary.com Unabridged (v 1.1). Random House, Inc. (accessed: June 18, 2009).</ref> was a maritime city in Bithynia on the Asian shore of the Bosporus across from ancient Constantinople. A major church in Chalcedon was the site of the [[Fourth Ecumenical Council]] in 451. The city is now called Kadikoy.