Authority of his work

He kept to a strict chronological scheme, and, where it can be accurately tested by the eclipses that he mentions, it fits closely. There are also a fair number of contemporary documents recorded on stone, most of which confirm his account both in general and in detail. There is the silent testimony of the three historians who began where he left off, not attempting, in spite of much independence of opinion, to revise what he had already done, not even the last book, which he clearly did not complete. Another historian, Philistus, a Syracusan who was a boy during the Athenian siege of his city, had little to alter or to add to Thucydides’ account in his own History of Sicily. Above all, there are the contemporary political comedies of Aristophanes—a man about 15 years younger than Thucydides with as different a temper and writing purpose as could be—which remarkably reinforce the reliability of the historian’s dark picture of Athens at war. The modern historian of this war is in much the same position as the ancient: he cannot do much more than translate, abridge, or enlarge upon Thucydides.

For Thucydides kept rigidly to his theme: the history of a war—that is, a story of battles and sieges, of alliances hastily made and soon broken, and, most important, of the behaviour of peoples as the war dragged on and on, of the inevitable “corrosion of the human spirit.” He vividly narrates exciting episodes and carefully describes tactics on land and sea. He gives a picture, direct in speeches, indirect in the narrative, of the ambitious imperialism of Athens—controlled ambition in Pericles, reckless in Alcibiades, debased in Cleon—ever confident that nothing was impossible for them, resilient after the worst disaster. He shows also the opposing picture of the slow steadiness of Sparta, sometimes so successful, at other times so accommodating to the enemy.

His record of Pericles’ speech on those killed in the first year of the war is the most glowing account of Athens and Athenian democracy that any leading citizen could hope to hear. It is followed (in, of course, due chronological order) by a minutely accurate account of the symptoms of the pestilence (“so that it may be recognized by medical men if it recurs”) and a moving description of the demoralizing despair that overtook men after so much suffering and such heavy losses—probably more than a quarter of the population, most of it crowded within the walls of the city, died.

Equally moving is the account of the last battles in the great harbour of Syracuse and of the Athenian retreat. In one of his best-known passages he analyzes by a most careful choice of words, almost creating the language as he writes, the moral and political effects of civil strife within a state in time of war. By a different method, in speeches, he portrays the hard fate of the town of Plataea due to the long-embittered envy and cruelty of Thebes and the faithlessness of Sparta, and the harsh brutality of Cleon when he proposed to execute all the men of the Aegean island city of Mytilene. Occasionally, he is forced into personal comment, as on the pathetic fate of the virtuous and much-liked Athenian Nicias.

He had strong feelings, both as a man and as a citizen of Athens. He was filled with a passion for the truth as he saw it, which not only kept him free from vulgar partiality against the enemy but served him as a historian in the accurate narrative of events—accurate in their detail and order and also in their relative importance. He does not, for example, exaggerate the significance of the campaign he himself commanded, nor does he offer a self-defense for his failure. Characteristically, he mentions his exile not as an event of the war but in his “second preface”—after the peace of 421—to explain his opportunities of wider contacts.

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Subsequent fame

The story of his later fame is a curious one. It has been mentioned above that in the two generations after his death three historians began their work where he had left off; but, apart from this silent tribute and late stories of his great influence on the orator Demosthenes, Thucydides is nowhere referred to in surviving 4th-century literature, not even in Aristotle, who, in his Constitution of Athens, describes the revolution in Athens in 411 and diverges in many ways from Thucydides’ account.

It was not until the end of the 4th century that the philosopher Theophrastus coupled Thucydides with Herodotus as a founder of the writing of history. Little is known of what the scholars of Alexandria and Pergamum did for his book; but copies of it were being made in considerable numbers in Egypt and so, doubtless, elsewhere, from the 1st to the 5th century ad. By the 1st century bc, as is clear from the writings of Cicero and Dionysius (who vainly disputed his preeminence), Thucydides was established as the great historian, and since that time his fame has been secure.