This book examines the relationship between imperialism and international law. It argues that colonial confrontation was central to theformation of international law and, in particular, its founding concept, sovereignty. Traditional histories of the discipline present colonialism and non-European peoples as peripheral concerns. By contrast, Anghie argues that international law has always been animated by the ‘civilizing mission’ -- the project of governing non-European peoples. Racial discrimination, cultural subordination and economic exploitation are constitutively significant for the discipline, rather than aberrations that have been overcome by modern international law. In developing these arguments, the book examines different phases of the colonial encounter, ranging from the sixteenth century to the League of Nations period.