Mirkine-Guetzévitch, B. Keywords: Eastern Europe | Revolutions | Development of international law | Mots clefs: Europe orientale | Révolutions | Développement du droit international | ABSTRACT After a presentation of the method of study of the history of international law, the author focuses on the relations between the old regime and the French Revolution in international relations. He then presents the principle of the unity of public law and discusses the international problems in Eastern Europe. The continuation of t…