This Oxford Handbook examines the sources of international law, how the understanding of sources changed throughout the history of international law; how the main legal theories understood sources; the relationship between sources and the legitimacy of international law; and how sources differ across the various sub-areas of international law.

This volume examines the role of League of Nations committees, particularly the Advisory Committee of Jurists (ACJ) in shaping the statute of the Permanent Court of International Justice (PCIJ). The authors explore the contributions of individual jurists and unofficial members in shaping the League’s international legal machinery. It is a companion book to The League of Nations and the Development of International Law: A New Intellectual History of the Advisory Committee of Jurists (Routledge, 2021). One of the guiding principles of the book is that the development of international law was a project of politics where the idea and notion of an international society must contend with the political visions of each state represented on the different legal committees in the League of Nations during the drafting of the Covenant. The book constitutes a major contribution to the literature in that it shows the inner workings of some of the legal committees of the League and how the political role of unofficial members was influential for the development of international law in the early twentieth century and how they influenced the political and legal process of the ACJ. The book will be an essential reference for those working in the areas of International Law, Legal History, International Relations, Political History, and European History.

The Oxford Handbook of International Legal Theory provides an accessible and authoritative guide to the major thinkers, concepts, approaches, and debates that have shaped contemporary international legal theory. The Handbook features 48 original essays by leading international scholars from a wide range of traditions, nationalities, and perspectives, reflecting the richness and diversity of this dynamic field. The collection explores key questions and debates in international legal theory, offers new intellectual histories for the discipline, and provides fresh interpretations of significant historical figures, texts, and theoretical approaches. It provides a much-needed map of the field of international legal theory, and a guide to the main themes and debates that have driven theoretical work in international law. The Handbook will be an indispensable reference work for students, scholars, and practitioners seeking to gain an overview of current theoretical debates about the nature, function, foundations, and future role of international law.

The post-Cold War proliferation of international adjudicatory bodies and increase in litigation has greatly affected international law and politics. A growing number of international courts and tribunals, exercising jurisdiction over international crimes and sundry international disputes, have become, in some respects, the lynchpin of the international legal system. The Oxford Handbook of International Adjudication charts the transformations in international adjudication that took place astride the twentieth and twenty-first century, bringing together the insight of 47 prominent legal, philosophical, ethical, political, and social science scholars. Overall, the 40 contributions in this Handbook provide an original and comprehensive understanding of the various contemporary forms of international adjudication. The Handbook is divided into six parts. Part I provides an overview of the origins and evolution of international adjudicatory bodies, from the nineteenth century to the present, highlighting the dynamics driving the multiplication of international adjudicative bodies and their uneven expansion. Part II analyses the main families of international adjudicative bodies, providing a detailed study of state-to-state, criminal, human rights, regional economic, and administrative courts and tribunals, as well as arbitral tribunals and international compensation bodies. Part III lays out the theoretical approaches to international adjudication, including those of law, political science, sociology, and philosophy. Part IV examines some contemporary issues in international adjudication, including the behavior, role, and effectiveness of international judges and the political constraints that restrict their function, as well as the making of international law by international courts and tribunals, the relationship between international and domestic adjudicators, the election and selection of judges, the development of judicial ethical standards, and the financing of international courts. Part V examines key actors in international adjudication, including international judges, legal counsel, international prosecutors, and registrars. Finally, Part VI overviews select legal and procedural issues facing international adjudication, such as evidence, fact-finding and experts, jurisdiction and admissibility, the role of third parties, inherent powers, and remedies. The Handbook is an invaluable and thought-provoking resource for scholars and students of international law and political science, as well as for legal practitioners at international courts and tribunals.

This new edition of Hugh Thirlway's authoritative text provides an introduction to one of the fundamental questions of the discipline: what is, and what is not, a source of international law. Traditionally, treaties between states and state practice were seen as the primary means with which to create international law. However, more recent developments have recognized customary international law, alongside international treaties and instruments, as a key foundation upon which international law is built. This book provides an insightful inquiry into all the recognized, or asserted, sources of international law. It investigates the impact of ethical principles on the creation of international law; whether 'soft law' norms come into being through the same sources as binding international law; and whether jus cogens norms, and those involving rights and obligations erga omnes have a unique place in the creation of international legal norms. It studies the notion of 'general principles of international law' within international law's sub-disciplines, and the evolving relationship between treaty-based law and customary international law. Re-examining the traditional model, it investigates the increasing role of international jurisprudence, and looks at the nature of international organisations and non-state actors as potential new sources of international law. This revised and updated book provides a perfect introduction to the law of sources, as well as innovative perspectives on new developments, making it essential reading for anyone studying or working in international law.

Over recent decades, international humanitarian law has been shaped by the omnipresence of so-called expert manuals. Astute and engaging, this discerning book provides a comprehensive account of these black letter rules and commentaries produced by private expert groups and demonstrates why the general acceptance of these expert manuals is largely unjustified. The author innovatively links interdisciplinary insights to the needs of military lawyers in practice, showing the pitfalls of relying on private manuals as arguable restatements and interpretations of the law 'as it is'.

This guide is an authoritative reference point for anyone interested in the creation or interpretation of treaties and other forms of international agreement. It covers the rules and practices surrounding their making, interpretation, and operation, and uses hundreds of real examples to illustrate different approaches treaty-makers can take.

This Commentary systematically and comprehensively examines the various sources of general international law relevant to international investment law and arbitration.

This book provides new insights into how change occurs in international law, through a uniquely comprehensive analysis of the mechanisms that allow the 'old' treaty-framework of the UN Convention on the Law of the Sea to respond to changing circumstances.

This book addresses the disparity between positive non-treaty law and its scholarly assessment in the area of moral concepts, understood as altruistic as opposed to reciprocal legal obligations. It shows how scholars are generously willing to assert the existence of a rule of international law, thereby moving further away from actual state practice, not taking into account the factors of legal rhetoric and the core survival interests of the state in the formation of custom and general principles of law. The main argument is that such moral concepts can simply not manifest themselves as non-treaty sources of international law from a dogmatic perspective. The reason is the inherent connection between the formation of the non-treaty sources of international law and state interest that makes it difficult, if not impossible, to assess state practice or opinio juris in the case of altruistic obligations. The book further demonstrates this finding by looking at two cases in point: Human rights and humanitarian exceptions to the prohibition of force. As opposed to the majority of existing works on the subject, State Interest and the Sources of International Law takes a bigger-picture approach to a number of distinct problems in international law scholarship by looking at the building blocks of international relations on the one hand, and merging this with sources doctrine on the other. It will be of interest to researchers, academics, and students in the fields of international law, human rights, international relations, political science, legal philosophy, and legal theory.