In this Handbook, historians and scholars of international relations examine the past and present of the intersection between History and IR, as well as looking to the future by laying out new questions and directions for research. The volume's four parts present a diverse array of methodological, philosophical, and historical insights. This compelling volume opens new avenues for research and encourages readers to explore the problems of modernity and granularity with an awareness of IR's positionality in the process and its implications. In this handbook, IR looks into the mirror of history to better understand itself.