This book investigates terrorism and anti-terrorism as related and interacting phenomena, undertaking a simultaneous reading of terrorist and statist ideologists in order to reconstruct the 'deadly dialogue' between them. This work investigates an extensive array of violent phenomena and actors, trying to broaden the scope and ambition of the history of terrorism studies. It combines an extensive reading of state and terrorist discourse from various sources with theorizing of modernity's political, institutional and ideological development, forms of violence, and its guiding images of self and other, order and disorder. Chapters explore groups of actors (terrorists, pirates, partisans, anarchists, Islamists, neo-Nazis, revolutionaries, soldiers, politicians, scholars) as well as a broad empirical source material, and combine them into a narrative of how our ideas and concepts of state, terrorism, order, disorder, territory, violence and others came about and influence the struggle between the modern state and its challengers. The main focus is on how the state and its challengers have conceptualized and legitimated themselves, defended their existence and, most importantly, their violence. In doing so, the book situates terrorism and anti-terrorism within modernity's grander history of state, war, ideology and violence. This book will be of much interest to students of critical terrorism studies, political violence, sociology, philosophy, and Security Studies/IR in genera Mikkel Thorup is Assistant Professor at the Institute of Philosophy and the History of Ideas, University of Aarhus, Denmark.