"The greatest historian that ever lived." Such was Macaulay's assessment of Thucydides (c. 460-400 BC) and his history of the Peloponnesian War, the momentous struggle between Athens and Sparta that lasted for twenty-seven years from 431 to 404 BC, involved virtually the whole of the Greek world, and ended in the fall of Athens. A participant in the war himself, Thucydides brings to his history an awesome intellect, brilliant narrative, and penetrating...