This volume offers an overview of several emerging trends and structural patterns in the development of international law, highlighting its evolution over the course of time. While the focus lies on leading principles, these are analysed within a broader context and through various different thematic lenses. Consequently, the chapters at the heart of this book contain comprehensive surveys of a number of specialised topics and particular sub-domains. The result is an original series of reflections, painting a chequered picture of pivotal changes and longitudinal shifts in the global legal community. Evolving Principles of International Law marks the occasion of the retirement of Karel Wellens as the Chair of International Law at Radboud University Nijmegen, The Netherlands, and has contributions by Andr©♭ Nollkaemper, Malcolm Shaw, Rein M©ơllerson and many others.