Der Untertan
By Heinrich Mann
Der Untertan is one of the best known novels of German author Heinrich Mann. The title character, Diederich Hessling, a dedicated 'Untertan' in the sense of a person subservient to a monarch or prince, is an immoral man who is meant to serve as an allegory of both the reign of Kaiser Wilhelm II and German society of his time.
Summary source: Wikipedia: Der Untertan · CC BY-SA 4.0