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 believed that the Peloponnesian War represented an event of unmatched importance.As such, he began to write the History at the onset of the war in 431. His intention was to write an account which would serve as "a possession for all time".The history breaks off near the end of the 21st year of the war and does not elaborate on the final conflicts of the war. This facet of the work suggests that Thucydides died whilst writing his history and more so, that his death was unexpected.

Thucydides ( c. 460 – c. 400 BC) was an Athenian historian and general. His History of the Peloponnesian War recounts the 5th-century BC war between Sparta and Athens until the year 411 BC. Thucydides has been dubbed the father of "scientific history" by those who accept his claims to have applied strict standards of impartiality and evidence-gathering and analysis of cause and effect, without reference to intervention by the gods, as outlined in his introduction to his work.