This article picks up on a tendency of recent criticism to look to Shakespeare for insights into contemporary politics, and extends it backwards to the period of German history known as the “Vormärz”―the period between 1815 and 1848. It establishes parallels between that period and the current debates about Brexit, and shows how equivalent issues are reflected in the accounts of King John given by three leading German critics of the “Vormärz” period―which also successively demonstrate the deleterious rise of German nationalism. These issues include: the weaknesses, mistakes and crimes of the powerful, and their effect both on the nation directly afflicted with them, and on others; the issue of national sovereignty and its relationship to th...