This is an enquiry into the place of the right of conquest in international relations since the early sixteenth century, and the causes and consequences of its demise in the twentieth century. It was a recognized principle of international law until the early years of this century that a statethat emerges victorious in a war is entitled to claim sovereignty over territory which it has taken possession. Sharon Korman shows how the First World War - which led to the rise of self-determination and to calls for the prohibition of way - prompted the reconstruction of international law and the consequent abolition of the title by conquest. Her conclusion, which highlights the merits and defects of themodern law as a vehicle for discouraging war by denying the title to the conqueror, challenges many of the assumptions that have come to constitute part of the conventional wisdom of our times. This is a study, not of international law narrowly conceived, but of the place of a changing legal principle in international history and the contemporary world.