History of the Peloponnesian War

But when the navy of Minos had been established, navigation between various peoples became saferfor the evil-doers on the islands were expelled by him, and then he proceeded to colonize most of them—and the dwellers on the sea-coast now began to acquire property more than before and to become more settled in their homes, and some, seeing that they were growing richer than before, began also to put walls around their cities.