Written four hundred years before the birth of Christ, this detailed contemporary account of the struggle between Athens and Sparta stands an excellent chance of fulfilling the author's ambitious claim that the work "was done to last forever." The conflicts between the two empires over shipping, trade, and colonial expansion came to a head in 431 b.c. in Northern Greece, and the entire Greek world was plunged into 27 years of war. Thucydides applied a passion for accuracy and a contempt for myth and romance in compiling this exhaustively factual record of the disastrous conflict that eventually ended the Athenian empire.

Thucydides' History has been enormously influential in both ancient and modern historiography. Analyses of the History generally occur in one of two camps. On the one hand, some scholars view the work as an objective and scientific piece of history. The judgment of J. B. Bury reflects his traditional interpretation of the work: "[The History is] severe in its detachment, written from a purely intellectual point of view, unencumbered with platitudes and moral judgments, cold and critical." On the other hand, in keeping with more recent interpretation that are associated with reader-response criticism, the History is better understood as a piece of literature rather than an objective record of the historical events. This view is embodied in the words of W. R. Connor, who describes Thucydides as "an artist who responds to, selects and skillfully arranges his material, and develops its symbolic and emotional potential."

The History of the Peloponnesian War is a historical account of the Peloponnesian War (431–404 BC), which was fought between the Peloponnesian League (led by Sparta) and the Delian League (led by Athens).The author's account of the conflict is widely considered to be a classic and regarded as one of the earliest scholarly works of history. The History is divided into eight books.

Thucydides was an Athenian historian, political philosopher and general. His History of the Peloponnesian War recounts the 5th century BC war between Sparta and Athens to the year 411 BC. Thucydides has been dubbed the father of "scientific history" because of his strict standards of evidence-gathering and analysis of cause and effect without reference to intervention by the gods, as outlined in his introduction to his work.

He has also been called the father of the school of political realism, which views the relations between nations as based on might rather than right. His text is still studied at advanced military colleges worldwide, and the Melian dialogue remains a seminal work of international relations theory.

More generally, Thucydides showed an interest in developing an understanding of human nature to explain behaviour in such crises as plague, massacres, as in that of the Melians, and civil war.