In the center of the article author’s attention is the book “Twilight of Europe” by G. A. Landau, which is sometimes regarded as direct predecessor of O. Spengler’s works. The article is devoted to G. A. Landau’s views on the nature of political, social, and legal processes in Europe after the First World War. The special attention is paid to the circumstances that Landau believed to be the signs of European civilization ill-being: the collapse of empires, nationalism, and the inclusion of the masses in the political life. Accordingly, the emphasis is placed on Landau’s evaluation of such concepts as “militarism”, “empire”, “nation”, etc.