History of the Peloponnesian War

As for cities, such as are of late foundation and since the increase of navigation, inasmuch as they have had since more plenty of riches, have been walled about and built upon the shore, and have taken up isthmi [that is to say, necks of land between sea and sea] both for merchandise and for the better strength against confiners. But the old cities, men having been in those times for the most part infested by thieves, are built farther up, as well in the islands as in the continent. For others also that dwelt on the seaside, though not seamen, yet they molested one another with robberies. And even to these times those people are planted up high in the country.