Long Wall (Thracian Chersonese)

[3] It is unknown how long the wall of Miltiades stood, but apparently it was left derelict soon after, for in the fifth century BC it had to be rebuilt by Pericles (Plutarch, Pericles, 19.1), and was again restored in the early fourth century by the Spartan commander Dercylidas (Xenophon, Hellenica, III.2.8–10; Diodorus Siculus, Bibliotheca, XIV.38.7), to protect the peninsula from raids by the Thracian tribes.

[1][3] The wall continues to be mentioned by various Greek and Roman geographers throughout antiquity, but by the fourth century it was apparently in a dilapidated state; in 400, the Goths under Gainas were easily able to cross it.

As described by the historian Procopius of Caesarea in his De Aedificiis, not only was the main wall strengthened and topped by breastworks and a covered portico, but it was also extended for some distance into the sea on both sides, and a permanent garrison was stationed there.

The most likely localization is on the isthmus 5 km east of Bulair at the base of the peninsula, which is also its narrowest part and corresponds to the length mentioned by Herodotus and Xenophon.

Thus it has been suggested that the wall of Justinian lay further east, running from the shore of the Propontis near modern Kazan Ağacı north to Ortaköy and thence northwest to the mouths of the river Melas in the Gulf of Saros.