This edited volume brings together leading international researchers in an attempt to disentangle and understand the multiple conflicts of sovereignty within the European polity in the aftermath of the 2008 economic crisis. While most research on sovereignty focuses on its international dimensions, what makes this volume distinctive is the focus on the mobilization of sovereignty discourses in national politics. Contrary to tired paradigms studying clashes between national and supranational sovereignty, the various chapters of the volume offer a provocation for the readers – what if these old vertical conflicts of sovereignty are increasingly complemented by horizontal conflicts between executives and parliaments at both the national and international level?