International legal positivism has been crucial to the development of international law since the nineteenth century. It is often seen as the basis of mainstream or traditional international legal thought. The Project of Positivism in International Law addresses this theory in the long-standing tradition of critical intellectual histories of international law. It provides a nuanced analysis of the resilience of the economic-positivist theory, and shows how influential its role was in shaping the modern frameworks of international law. The book argues that the rise of positivist international law was inseparable from philosophical developments placing the notion of conflict of interests at the centre of collective life. Where previously international thought was dominated by notions of the right, the just, and the good, increasingly international relations became viewed as 'interests' in need of harmonisation. In this context, international law was re-founded as the universal law that could harmonise the interests of both public and private international entities. The book argues that these evolutions in philosophical thought were bound up with the consolidation of capitalism, and with the ideas about human existence and human nature which emerged in that process. It provides an innovative analysis of the selected biography of ideas which it presents, including a detailed focus on the work of Hans Kelsen, one of the leading positivist thinkers of the twentieth century. It also argues that the work of Lassa Oppenheim should be included within this analysis, as providing some of the key founding texts of positivism in international law. This book will be a fascinating read for scholars and students of international legal theory, historians of ideas, and legal philosophers.

This books maps out the territory of international law and religion challenging received traditions in fundamental aspects. On the one hand, the connection of international law and religion has been little explored. On the other, most of current research on international legal thought presents international law as the very victory of secularization. By questioning that narrative of secularization this book approaches these traditions from a new perspective. From the Middle Ages' early conceptualizations of rights and law to contemporary political theory, the chapters bring to life debates concerning the interaction of the meaning of the legal and the sacred. The contributors approach their chapters from an array of different backgrounds and perspectives but with the common objective of investigating the mutually shaping relationship of religion and law. The collaborative endeavour that this volume offers makes available substantial knowledge on the question of international law and religion.