The literature on norm socialization and Europeanization has largely focused on successful norm diffusion, but thus far it has hardly addressed the norm backlash from the respective societies. To more fully grasp the interaction between member states’ roles and their institutional preferences we provide a conceptual model for the de-composition of national role conceptions. This model is applied in case studies on German and Czech European policies in the constitutionalization process of the European Union. The paper illustrates how the composition of Czech and German roles has changed over time and how these national role conceptions shape the countries’ respective institutional preferences. We conclude that historical role experience is considered as a powerful explanatory tool for the policies of today’s European Union member states.