have included the north shore of the Gulf of Astacus which extends towards Nicomedia. Important villages in Chalcedonia included Chrysopolis (the modern Üsküdar) and Panteicheion (Pendik). Strabo notes that "a little above the sea" in Chalcedonia lies "the fountain Azaritia, which contains small crocodiles".

In its early history Chalcedon shared the fortunes of Byzantium. Later, the 6th-century