  Carl Schmitt’s early career as an academic lawyer falls into the last years of the Wilhelmine Empire. (See for Schmitt’s life and career: Bendersky 1983; Balakrishnan 2000; Mehring 2009.) But Schmitt wrote his most influential works, as a young professor of constitutional law in Bonn and later in Berlin, during the Weimar-period: Political Theology, presenting Schmitt’s theory of sovereignty, appeared in 1922, to be followed in 1923 by The Crisis of Parliamentary Democracy, which attacked the legitimacy of parliamentary government. In 1927, Schmitt published the first version of his most famous work, The Concept of the Political, defending the view that all true politics is based on the distinction between friend and enemy. The culmination of Schmitt’s work in the Weimar period, and arguably his greatest achievement, is the 1928 Constitutional Theory, which systematically applied Schmitt’s political theory to the interpretation of the Weimar constitution. During the political and constitutional crisis of the later Weimar Republic Schmitt published Legality and Legitimacy, a clear-sighted analysis of the breakdown of parliamentary government in Germany, as well as The Guardian of the Constitution, which argued that the president as the head of the executive, and not a constitutional court, ought to be recognized as the guardian of the constitution. In these works from the later Weimar period, Schmitt’s declared aim to defend the Weimar constitution is at times barely distinguishable from a call for constitutional revision towards a more authoritarian political framework (Dyzenhaus 1997, 70–85; Berthold 1999; Kennedy 2004, 154–78; Breuer 2012).