Which Greek historian wrote 'History of the Peloponnesian War'?

The Greek historian who wrote History of the Peloponnesian War was Thucydides.

Thucydides was an Athenian historian and general who documented the conflict between Athens and Sparta and their allies. The war lasted from 431 to 404 BC, though Thucydides’ surviving account breaks off in 411 BC, before the war ended. The work was later divided into eight books.

His history is notable for its attention to evidence, chronology, political motives, and human behavior rather than explanations based on divine intervention. Thucydides described the causes and consequences of war, including the growth of Athenian power and Sparta’s fear of it. He also recorded speeches, while acknowledging that they represented the arguments appropriate to each situation rather than exact transcripts.

A common mix-up is Herodotus, who wrote about the Greco-Persian Wars in The Histories. Xenophon continued the narrative of the Peloponnesian War in Hellenica after Thucydides’ unfinished account.