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In page Thucydides:

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The History of the Peloponnesian War continued to be modified well beyond the end of the war in 404 BC, as exemplified by a reference at Book I.1.13[5] to the conclusion of the war.[6] After his death, Thucydides's History was subdivided into eight books: its modern title is the History of the Peloponnesian War. This subdivision was most likely made by librarians and archivists, themselves being historians and scholars, most likely working in the Library of Alexandria.[citation needed]