How Thucydides went from a humiliated Athenian general to became one of the greatest historians
In 424 BCE, an Athenian general named Thucydides failed to prevent the Spartan capture of the strategically vital city of Amphipolis, and the Athenian democracy punished him with twenty years of exile.
That punishment was certainly painful, and it also produced arguably one of the most important works in Western intellectual history: the History of the Peloponnesian War.
Thucydides later stated that he had begun writing at the very outbreak of the war because he had judged it would be the greatest conflict experienced up to that point by the Greeks.
From his position as both participant and outcast, he created a method of writing history that prioritised eyewitness testimony and factual accuracy over myth and moralising, and many scholars have therefore described him as the father of scientific history and the first great analytical historian.
An aristocratic Athenian with Thracian connections
Since Thucydides is the primary source of information about his own life, the biographical details that are available to modern historians are limited.
He was born around 460 BCE in the Athenian deme of Halimous, a coastal district south of the city.
His father was named Olorus and carried a distinctly Thracian name, which suggests that the family had ancestral ties to the Thracian region in northeastern Greece.
According to Plutarch, Thucydides was probably related to the celebrated Athenian general Miltiades, the hero of the Battle of Marathon in 490 BCE, and to Miltiades’ son Cimon, a prominent conservative political figure.
As a member of this wealthy aristocratic family, Thucydides had inherited gold mines at Scapte Hyle, a coastal area in Thrace opposite the island of Thasos.
The income from those mines had given him considerable financial independence, which later allowed him to fund his historical research during his long exile.
Ancient biographical traditions also connected him closely to Thrace through marriage and property, but several of these details came from later writers and cannot be verified with confidence.
One popular anecdote was recorded centuries after his death and claims that as a boy Thucydides attended a public reading by Herodotus in the Athenian agora and wept with admiration, which prompted Herodotus to remark that the boy had a hunger for knowledge.
The plague and the war, as well as the fall of Amphipolis
When the Peloponnesian War broke out in 431 BCE between Athens and the Spartan-led Peloponnesian League, Thucydides recognised its significance immediately and began taking notes, since he was old enough to assess that the conflict would be long and destructive.
In 430 BCE, a devastating plague swept through Athens, and it killed tens of thousands of people, who included the great statesman Pericles.
Thucydides himself contracted the disease, and his survival had given him a unique perspective.
In Book 2 of the History, he later wrote a remarkably detailed clinical description of the plague’s symptoms as both eyewitness and survivor, and modern scholars have continued to debate the exact disease, with typhus, typhoid fever, smallpox, and viral haemorrhagic disease all proposed at different times.
In 424 BCE, the Athenian assembly elected him as one of the ten strategoi, or generals, for the year, and he took command of a small fleet stationed at Thasos.
During that winter, the Spartan general Brasidas launched a surprise attack on Amphipolis, an Athenian colony on the Strymon River that controlled access to Thracian timber and mining wealth, as well as the inland routes of the region.
Eucles was the Athenian commander at Amphipolis and sent an urgent request for reinforcements.
Thucydides sailed immediately, but Brasidas had moved with great speed and had also offered the Amphipolitans unusually generous surrender terms before the fleet could arrive.
By the time Thucydides reached the area, Amphipolis had already fallen, and he managed only to secure the nearby port of Eion.
For this failure, the Athenian assembly sentenced him to exile for twenty years.
Thucydides himself later stated that he had lived in exile for twenty years after his command at Amphipolis.
Some ancient sources attribute his prosecution to Cleon, a prominent demagogue who favoured aggressive military action.
How exile became an opportunity for historical inquiry
Rather than ending his intellectual career, exile gave Thucydides the freedom to pursue his historical project with extraordinary dedication.
He spent two decades travelling the Greek world and gathered information from both Athenian and Peloponnesian sources.
As he himself explained, exile meant that he could observe affairs from both warring sides, particularly the Spartan side, which would have been impossible if he had stayed an active Athenian citizen.
During these years of forced absence, Thucydides interviewed eyewitnesses and cross-examined their accounts, and he compiled detailed records of battles and negotiations.
He wrote and revised extensively, and he worked with the deliberate care of a scholar who intended his work to be authoritative for future generations.
His approach to evidence was rigorous: he refused to include material that was based on hearsay or legend.
In a famous passage early in his History, he described his work as a ktema es aiei, which is often translated as ‘a possession for all time’, rather than a performance piece that was designed to please an audience.
This is a remark that was widely interpreted as a criticism of Herodotus and other earlier prose writers who favoured entertaining storytelling.
A new method of writing history
What arguably set Thucydides apart from every historian before him was his commitment to factual accuracy and analytical rigour.
Herodotus was often called 'the father of history' and wrote about the Persian Wars with a broad interest in geography and moral lessons, and he frequently included myths and supernatural explanations.
Thucydides rejected that approach entirely, limiting himself to political and military events that he could verify through firsthand observation or reliable testimony.
For Thucydides, the causes of war lay in human nature and the competition for power, not in the will of the gods.
At the beginning of his History, he also argued that the immediate disputes of the 430s BCE were less important than what he called the truest cause of the war: the growth of Athenian power and the fear that this caused in Sparta.
One of the most distinctive features of the History is Thucydides’ use of speeches at critical moments.
Perhaps the most famous is the Funeral Oration, which was attributed to Pericles and delivered in 431 BCE to honour Athens’ war dead.
It has been admired for centuries as a powerful statement of democratic ideals.
Thucydides explained that he recorded what speakers said as closely as he could remember, or, if that was not possible, what he believed the situation required them to say.
Scholars have debated the accuracy of these speeches ever since, but their inclusion gave the History a dramatic power that purely factual reporting could not achieve.
The surviving work, which later editors divided into eight books, also included some of the most famous episodes in Greek historical writing.
In the Melian Dialogue of 416 BCE, Thucydides presented a stark exchange between Athenian envoys and the people of Melos that examined power and necessity, as well as the ruthless logic of empire.
His account of the Sicilian Expedition later in the war has also been widely admired for its command of the story and its detailed explanation of how overconfidence and poor judgement, as well as strategic failure, destroyed a massive Athenian force far from home.
Equally significant was his analysis of political behaviour during crisis. His account of the civil war in Corcyra in 427 BCE contains a chilling description of how political violence distorted the meaning of ordinary words, where reckless aggression was called courage and cautious moderation was dismissed as cowardice.
An unfinished masterpiece
After Athens surrendered to Sparta in 404 BCE, which ended the twenty-seven-year war, Thucydides was apparently permitted to return home.
According to the travel writer Pausanias, a politician who was named Oenobius had a law passed that allowed his return.
The circumstances of his death are uncertain: Pausanias claimed he was murdered while travelling back to Athens, and Plutarch recorded a tradition that his body was buried in Cimon’s family plot.
Other scholars have suggested that he lived until around 397 BCE. What is certain is that his History breaks off in mid-sentence during the winter of 411 BCE, and it covered only about twenty of the war’s twenty-seven years.
This strongly suggests that death interrupted his writing before he could complete it.
Xenophon’s Hellenica later picked up the story at almost exactly the point where Thucydides had stopped.
Over the centuries that followed, Thucydides’ influence on the discipline of history was arguably enormous.
Later Greek historians, including Polybius and Diodorus, treated his work as a model of truthful reporting, and the Roman writer Lucian credited Thucydides with giving Greek historians their fundamental law: to record events as they actually happened.
In 1629, the English philosopher Thomas Hobbes translated the History into English and praised Thucydides as the most political of all historians.
In later centuries, historians such as Leopold von Ranke admired his attention to evidence, and modern realist thinkers in political science and international relations have continued to study him closely.
Today, Thucydides is widely read because his analysis of fear and power, as well as self-interest, in interstate conflict still provides arguably a powerful framework for understanding the behaviour of states in the modern world.