This book takes an unflinching look at the roles and functions played by the idea of universality in international legal discourses, as well as the narratives of progress that often accompany it. In doing so, it provides a critical appraisal of the mechanisms of inclusion and exclusion attendant to international law and its universalist discursive strategies. Universality is therefore not reduced to the question of the geographical outreach of international law but is instead understood in terms of boundaries. This entails examining how the idea of universality was developed in the dominant vernaculars of international law - primarily English and French - before being universalised and imposed upon international lawyers from all traditions. This analysis simultaneously offers an opportunity to revisit the ideologies that constitute the identity of international lawyers today, as well as the socialisation and legal educational processes that international lawyers undergo. With an emphasis on the binaries that arise from the invocation of the idea of universality in international legal discourses, this book sheds new light on the idea of universality as a fraught site of contestation in international legal discourses.