This two-volume work on EU landmark cases discusses the most iconic judgments developed by the European Court of Justice since 1957. It considers the way in which The European Court of Justice has played a fundamental role in the construction of the European Union in the past 70 years. Its 'landmark' decisions have often been controversial yet no-one could deny that they have been crucial in 'constituting' the Union legal order as we find it today. From Van Gend en Loos and Costa v ENEL to Cassis de Dijon and Kadi, Landmark Cases in EU Law explores the most important and well-known cases in two volumes. Volume 1 explores the 'constitutional cases' that have come to define the legal nature and competences of the Union.