This book examines the conditions that facilitate survival in ministerial office and how they are linked to ministerial competence, the political survival of heads of government and the nature of political institutions. Presenting a formal theory of political survival in the cabinet, it systematically analyses the tenure in office of more than 7,300 ministers of foreign affairs covering more than 180 countries spanning the years 1696-2004. In doing so, it sheds light not only on studies of ministerial change but also on diplomacy, the occurrence of war, and the democratic peace in international relations.