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.
Ledon
Ledon ( or Λέδων) was a town of ancient Phocis in Greece, north of Tithorea, the birthplace of Philomelus, the commander of the Phocians in the Third Sacred War. During that war, it was taken by the forces of Philip II of Macedon in 346 BCE. In the time of Pausanias (2nd century) it was abandoned by the inhabitants, who settled upon the Cephissus, at the distance of 40 stadia from the town, but the ruins of the latter were seen by Pausanias.