Appalled by the state of affairs, realising the greatness and the nearness of the danger… and thinking, as men are apt to think in great crises, that when all had been done they still have something left to do, and when all had been said they have not said enough, again called on the captains one by one… he reminded them of their country, the freest of the free, and of the unfettered discretion allowed to all in it to live as they pleased.
Thucydides, The Peloponnesian War, 7.69.2

Thucydides: The Father of Political Realism
Thucydides was an Athenian historian, general, and politician who lived during the Peloponnesian War, which was fought between Athens and Sparta from 431 to 404 BCE. His account of the war, “History of the Peloponnesian War,” is considered a classic and one of the earliest known history books. Thucydides’ work is still studied today, not only for its historical value but also for its insights into human nature and politics. In this blog post, we will explore Thucydides’ life, his work, and his contributions to political theory.
The Life of Thucydides
Thucydides was born in Athens around 460 BCE, into a wealthy and influential family. He was related to the Athenian general Miltiades, who had led the Athenians to victory against the Persians at the Battle of Marathon in 490 BCE. Thucydides was also related to Cimon, another Athenian general who played a prominent role in Athenian politics in the early 5th century BCE.
Thucydides was a young man when the Peloponnesian War broke out in 431 BCE. He was appointed as one of the Athenian generals and was responsible for defending the city of Amphipolis in northern Greece. However, he failed to prevent the city from falling to the Spartans, and he was subsequently exiled from Athens for 20 years.
During his exile, Thucydides travelled extensively throughout the Mediterranean world, gathering information and conducting interviews with people who had been involved in the war. He also wrote his history of the war, which he completed shortly before his death around 400 BCE.
Thucydides’ Work
Thucydides’ “History of the Peloponnesian War” is a detailed and comprehensive account of the war between Athens and Sparta. It is divided into eight books and covers the period from the beginning of the war in 431 BCE to the fall of Athens in 404 BCE.
Thucydides’ work is notable for its objectivity and impartiality. He sought to provide a factual and accurate account of the war, based on his own observations and the testimony of eyewitnesses. He also tried to avoid the mythological and supernatural elements that were common in earlier histories.
Thucydides’ work is also notable for its emphasis on the role of human nature and politics in the outbreak of war. He argued that the war was caused by the fear, honour, and self-interest of the Athenians and Spartans, rather than by the will of the gods or other supernatural forces.
Thucydides’ Contributions to Political Theory
Thucydides’ “History of the Peloponnesian War” is considered a seminal work in the field of political theory. It is often cited as an early example of political realism, which emphasizes the role of power, self-interest, and human nature in politics.
Thucydides’ work is also notable for its emphasis on the importance of strategic thinking and decision-making in politics. He argued that successful leaders must be able to anticipate the actions of their opponents and make decisions based on a clear understanding of their own interests and the interests of their adversaries.
Thucydides’ work has had a profound influence on political theorists and historians throughout the centuries. His emphasis on the role of human nature and politics in the outbreak of war has been particularly influential, and his work is still studied today as a classic example of political realism.
Thucydides and the Modern World
Thucydides’ work has continued to be relevant in the modern world. His emphasis on the role of power, self-interest, and strategic thinking in politics has been particularly influential in the field of international relations.
Thucydides’ concept of the “Thucydides Trap” has also gained widespread attention in recent years. The Thucydides Trap refers to the idea that when a rising power threatens to displace a ruling power, the result is often war. This concept has been used to explain the outbreak of wars throughout history, including the Peloponnesian War, the Napoleonic Wars, and both World Wars.
Conclusion
Thucydides was a remarkable figure in ancient Greek history. His work, “History of the Peloponnesian War,” is a classic example of historical writing and political theory. Thucydides’ emphasis on the role of human nature and politics in the outbreak of war has been particularly influential, and his work is still studied today as a classic example of political realism.
Thucydides’ insights into the nature of power, self-interest, and strategic thinking in politics have continued to be relevant in the modern world. His concept of the Thucydides Trap has gained widespread attention in recent years, and his work is still cited as a seminal example of political theory.
