Because of the overarching shadow of ‘the state’ in all things diplomatic, traditional diplomatic history has neglected the study of any actors in foreign relations other than state diplomats, such as ambassadors. This volume focuses on the question of how and why consuls, missionaries, and spies not formally tied to the state or a prince could play a role in premodern diplomatic relations. It highlights their multiple loyalties, their volatility, and the porous boundaries of diplomatic activity. Historical research on non-state actors – in the context of the so-called new diplomatic...