In the Early Modern Age, the themes of war, peace and negotiation with internal and external actors of the different political communities were particularly important and they extended from the European continent to the non-European worlds. It was a phenomenon that involved the society as a whole and not only diplomats and soldiers. The tools and practices adopted by the societies of the ancien régime constructed a complex web of actions and theories that ranged from the construction of the diplomatic system to private negotiation in and out of the judicial sphere.