This Festschrift is published on the occasion of Gerhard Hafner’s 65th birthday and his retirement as a professor at the University of Vienna. It assembles a great number of renowned friends and colleagues in international law honouring Gerhard Hafner’s outstanding career as scholar, diplomat, legal adviser and arbitrator. The diversity of areas selected for this Festschrift reflects the generalist approach of Gerhard Hafner towards international law. Among the topics on which his contribution was particularly influential are the fragmentation of international law, the law of State immunity and international criminal law, which feature prominently in the Festschrift. Other areas covered are the theory of international law (including sources), basic principles of international law, codification of international law, subjects of international law, international dispute settlement, the law of the sea and international environmental law, human rights and humanitarian law and the law of the European Union.

Fragmentation has been much discussed as a threat to international law as a legal system. This book contends that the fragmentation of international law is far exceeded by its convergence, as international bodies find ways to account for each other and the interactions of emerging sub-fields. Reasserting its role as the 'principal judicial organ of the United Nations', the International Court of Justice has ensured that the centre of international law can and does hold. This process has strengthened a trend towards the reunification of international law. In order to explore this process, this book looks at fragmentation and convergence from the point of view of the centre of the International Court and of the position of other courts and tribunals. Featuring contributions by leading international lawyers from a range of backgrounds, this volume proposes both a new take and the last word on the fragmentation debate in international law.

Concepts shape how we understand and participate in international legal affairs. They are an important site for order, struggle and change. This comprehensive and authoritative volume introduces a large number of concepts that have shaped, at various points in history, international legal practice and thought; intimates at how the many projects of international law have grappled with, and influenced, the world through certain concepts; and introduces new concepts into the discipline.

The Law of Nations and Natural Law 1625-1800 offers innovative studies on the development of the law of nations after the Peace of Westphalia. This period was decisive for the origin and constitution of the discipline which eventually emancipated itself from natural law and became modern international law. A specialist on the law of nations in the Swiss context and on its major figure, Emer de Vattel, Simone Zurbuchen prompted scholars to explore the law of nations in various European contexts. The volume studies little known literature related to the law of nations as an academic discipline, offers novel interpretations of classics in the field, and deconstructs ‘myths’ associated with the law of nations in the Enlightenment.

The current system of international law is experiencing profound transformations. Indeed, the simultaneous processes of globalization combined with the disintegration of international systems of governance and law-making pose complex challenges for legal scholarship. The doctrinal response to these challenges has been theorized within two seemingly contradictory discourses in international law: fragmentation and constitutionalisation. This book takes an innovative approach to international law, viewing the processes of the fragmentation and constitutionalisation as being profoundly interconnected and reflective of each other. It brings together a select group of contributors, including both established and emerging scholars and practitioners, in order to explore the ways in which the problems of fragmentation and constitutionalisation are viscerally linked one to the other and thus mutually conditioning and stimulating. The book considers the theory and practice of international law looking at the two phenomena in relation to the various fields of international law such as international criminal law, cultural heritage law and international environmental law.