History of the Peloponnesian War (1.6.5-1.7.1)

They also set the example of contending naked, publicly stripping and anointing themselves with oil in their gymnastic exercises. Formerly, even in the Olympic contests, the athletes who contended wore belts across their middles; and it is but a few years since that the practice ceased. To this day among some of the barbarians, especially in Asia, when prizes for boxing and wrestling are offered, belts are worn by the combatants.

And there are many other points in which a likeness might be shown between the life of the Hellenic world of old and the barbarian of to-day.

With respect to their towns, later on, at an era of increased facilities of navigation and a greater supply of capital, we find the shores becoming the site of walled towns, and the isthmuses being occupied for the purposes of commerce, and defence against a neighbor. But the old towns, on account of the great prevalence of piracy, were built away from the sea, whether on the islands or the continent, and still remain in their old sites. For the pirates used to plunder one another, and indeed all coast populations, whether seafaring or not.