Originally published between 1830 and 1835, this three-volume critical edition by Thomas Arnold (1795-1842) of Thucydides" History of the Peloponnesian War remains a benchmark publication. The text and apparatus closely follows Bekker"s 1821 critical edition. However, Arnold freshly collated a number of Greek manuscripts, including the important tenth-century Laurentian manuscript C of Book 3, which led to some revision of Bekker"s text. The work"s major contribution to Thucydidean scholarship lies in the detailed topographical and historical notes accompanying the text, which explain the geographical and political background to the History. For many generations Arnold"s work has provided an indispensable guide through the complex geo-political context of the History, enabling students to appreciate its narrative, language and place in historiography.