The relationship between political theory, including the history of political thought, and International Relations theory, including the history of international thought, has been, and to some extent remains, complex and troubled. On both sides of the Atlantic, the mid-twentieth century founders of International Relations as an academic discipline drew extensively on the canon of political thought, but approached the subject in an uncritical way, while political philosophers largely disdained the international as a focus. This changed in the 1970s and 1980s, with the emergence of the ‘justice industry’ based on critiques of Rawls’ A Theory of Justice and a consequent recovering of the past history of cosmopolitan and communitarian thought. A new discourse emerged in this period – International Political Theory – bridging the gap between political thought and international relations and stimulating a far more creative and scholarly approach to the history of international thought. However, in a social scie...