Over the past few decades, European countries have witnessed a proliferation of legal norms concerning marginalised individuals and minorities who increasingly invoke them in front of courts to assert their rights and claim protection. The present volume explores the relationship between law, rights and social mobilisation in Europe. It specifically inquires into the extent and ways in which legal processes and entitlements are mobilised by less privileged social actors to advance their rights claims and pursue social change. Most distinctly, it explores such processes in the context of the multi-level European system, characterised by the existence of multiple legal and judicial arenas at the national, subnational and supranational/transnational level. In such a complex system of law and governance in Europe, concepts like legal opportunity structures, as well as the factors shaping them need to be reconceptualised. How does the multi-level European context distinctly shape the nature and salience of rights, as well as their mobilisation by individuals and minority actors?