Oncken, Wilhelm, 1838-1905, German historian. He taught at the Univ. of Giessen after 1866. A typical national liberal of the 19th cent., Oncken regarded history as a means of national political education. His early field was Greek history, but he later concentrated on the history of the Prussian state and of German unification. He edited a cooperative history, the Allgemeine Geschichte in Einzeldarstellungen [general history in its special phases] (45 vol., 1876-93), which became a standard household fixture for the educated German family. Several of Oncken's own volumes were included in the collection.