In many parts of today's world, populist politics increasingly challenge traditional constitutionalist conceptions. The present volume provides a variety of perspectives on democratic decay and the erosion of the rule of law, on the re-emergence of popular sovereignty as a political category, and on public reason in an age of 'post-truthism', focusing on the CEE region and South Eastern Europe. With each contribution approaching the subject from its individual angle and having its original 'tone', the volume combines theoretical insights and in-depth analyses of current developments in selected polities.