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 Kadiköy. 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 aboveground vestiges of the ancient city survive in Kadiköy today; artifacts uncovered at Altiyol and other excavation sites are on display at the Istanbul Archaeological Museum.