AUGUST POTTHAST (1824-1898), German historian, was born at Hbxter on the 13th of August 1824, and was educated at Paderborn, Munster and Berlin. He assisted G. H. Pertz, the editor of the Monumenta Germaniae historica, and edited the Regesta pontificum romanorum, 1198-1304 (Berlin, 1874-1875). From 1874 to 1894 he was librarian of the German Reichstag. Potthast is chiefly known through his monumental Bibliotheca historica medii aevi (1862), a guide to the sources of European history in the middle ages. The work, in the form of an index, gives particulars of practically all the historical writers of Europe and their work between 375 and 150o. A new and enlarged edition appeared at Berlin in 1896. Potthast died on the 13th of February 1898.