Anuschka Tischer starts out with the historical analyses of the book by elaborating the dialectic of war discourses and international order in early modernity: according to Tischer, nearly every prince in early modern Europe came up with a ‘just reason’ when going to war. Whereas the theory of international law represented academic opinions, the political justifications offered the official view which fed into the public discourse. By referring to a general international law in their war declarations (and counter-declarations), the belligerent parties shaped the pattern of today’s modern international law. However, the early modern justifications represented the political and social values of pre-revolutionary Europe. While international law was regarded as universal, the European Christian powers distinguished between wars in and outside of Europe. The chapter reveals the contradictions inherent in this distinction by analysing how princes in early modern Europe justified their wars, which norms and orders were accepted, and how far international law was the result of elaborate discussions and power politics. Tischer’s findings are picked up by Hendrik Simon in his contribution on the nineteenth-century discourse of war and international order.