This book provides a contextual account of the first anarchist theory of war and peace, and sheds new light on our contemporary understandings of anarchy in International Relations. Although anarchy is arguably the core concept of the discipline of international relations, scholarship has largely ignored the insights of the first anarchist, Pierre-Joseph Proudhon. Proudhon's anarchism was a critique of the projects of national unification, universal dominion, republican statism and the providentialism at the heart of enlightenment social theory. While his break with the key tropes of...