What is Irredentism? What kind of challenge does it present to the International Order of States? This Hauptseminar will address these questions from a theoretical and empirical perspective. The syllabus is divided into two parts. The first one will explore how irredentism has been conceptualized by scholars of international relations, nationalism, conflict management, and international law. The second one will explore the relevance of these theoretical debates for a series of historical and contemporary examples of irredentism in practice. These sessions will include, among others, the following cases: Italian irredentism in the 19th century, the Palestinian-Israeli conflict, the Pakistani, Indian and Chinese claims over Kashmir, China and Taiwan, and the case of Cyprus. The seminar is intended for students with previous knowledge of modern international history.