Book excerpt: Exploring the conflict management trajectories of Northern Ireland and Sri Lanka, this book engages in a discussion that highlights the importance of ‘decolonising’ approaches to peacebuilding and conflict management in deeply divided societies. Existing knowledge on the topic is largely produced in the Western academy, using global North-centric approaches. This book, written by a researcher from the global South who navigates the political life of a deeply divided society in Western Europe, begins a conversation on a new, 21st century re-conceptualization of ethno-national conflict in deeply divided societies, based on a paradigm of decolonising. This book will appeal to policymakers and practitioners in peacebuilding and related areas worldwide, and students of peace and conflict studies, as well as a general readership with an interest in decolonial approaches to world politics.