Guerra e pace nella teoria giuridica di Hans Kelsen

War and peace are, even in Hans Kelsen’s legal theory, two closely related concepts. The essay shows how, nevertheless, the specific relevance of these concepts emerges, in the development of Kelsen’s thinking, at distinct and rather distant moments in time, and how the positions they occupy, within the categorical architecture of the reine Rechtslehre, turn out to be quite heterogeneous. Two additions (Parerga) complement the research and enrich its results, from different perspectives of analysis: the first, philosophical, concerns the fundamental relationship between “ought” and “legal duty”; the second, philological, concerns the controversial relationship between “state of law” and “state of peace”.