Chalcedon
The site of Chalcedon is located on a small peninsula on the north coast of the Sea of Marmara, near the mouth of the Bosphorus. A stream, called the Chalcis or Chalcedon in antiquity and now known as the Kurbağalıdere (Turkish: "stream with frogs"), flows into Fenerbahçe bay. There Greek colonists from Megara in Attica founded the settlement of Chalcedon in 685 BC, some seventeen years before Byzantium.
Apollonia (Chalcidice)
Apollonia () was the ancient chief town of Chalcidice in Macedonia, situated north of Olynthus, and a little south of the Chalcidian mountains. That this Apollonia is a different place from Apollonia in Mygdonia, appears from Xenophon, who describes the Chalcidian Apollonia as distant from Olynthus. It was probably this Apollonia that struck the beautiful Chalcidian coins, bearing on the obverse the head of Apollo, and on the reverse his lyre, with the legend . Demosthenes claims that Apollonia was among the Greek cities destroyed by Philip II of Macedon, probably during his war against the Chalcidian League in 348 BCE when he also destroyed Olynthus.