In this paper I aim to explain the concept of sovereignty as an esential atribute of the state which at its core summarizes the question of the holder of political and legal power and the way that this power is distributed, and through presentation of prominent theorists of sovereignty the evolution of its content from the original theory formed in the 16th century in order to serve afirmation of the apsolutism of the monarh all through to contemporary globalization processes that require its adaptation. As this evolution of its content moved from the concentration of power to its division among different actors, it made its locus not exclusively within the state, but by its sovereign will partly transffered to new actors in international relations. Such a new actor is the European Union as a new legal order of international law whose internal integration process I aime to present significantly determined by accomodation of supranational European Union law and national legal orders through a dynamic relation between the Court of justice of the European Union and the highest national tribunals of the member states, with special emphasis on exemplary practise of German Federal Constitutional Cort, explaining the mechanisms developed by the costitutional legal practice in effort to relativise ex nihilo constructed principle of the supremacy of European Union law and the democratically illegitimate expansion of the competences of the European Union.