The past is constantly present, not least in the study of imperialism and imperial forms of power in international politics. This volume shows how historical trajectories have shaped international affairs covering a wide range of imperial and (post-) colonial settings in international politics, substantiating the claim that imperial and colonial legacies - and how they have transformed over time - are foundational to the historicity of international politics. It contributes to debates on the role of history in International Relations (IR) by combining theoretical arguments on the role of history through the concept of 'historicity' with concrete empirical analyses on a wide range of imperial and colonial legacies. This volume also advances interdisciplinary perspectives on this topic by fostering dialogue with Historical Sociology and Global History. It will interest scholars and advanced students of IR, historical sociology and global politics, especially those working on the history of international politics, and the legacies of colonialism and imperialism.