Thucydides 
The History of The Peloponnesian War 

"The History of The Peloponnesian War" by Thucydides is a seminal historical work that chronicles the devastating conflict between Athens and Sparta and their respective allies from 431 to 404 BCE. Thucydides, an Athenian historian and general, provides an authoritative and detailed account of the causes, events, and consequences of the war. His objective and analytical approach to recording historical facts set a standard for historical writing. This enduring classic remains a crucial source for understanding ancient Greek history, politics, and military strategy.