History of the Peloponnesian War

However, the cities which were founded in more recent times, when navigation had at length become safer, and were consequently beginning to have surplus resources, were built right on the seashore, and the isthmuses[*](i.e. fortified cities were established on peninsulas, connected with the mainland by an isthmus, which was then walled off as Epidamnus (Thuc. 1.26.5) and Potidaea (Thuc. 4.120.3).) were occupied and walled off with a view to commerce and to the protection of the several peoples against their neighbours. But the older cities, both on the islands and on the mainland, were built more at a distance from the sea on account of the piracy that long prevailed—for the pirates were wont to plunder not only one another, but also any others who dwelt on the coast but were not sea-faring folk—and even to the present day they lie inland.