As a quarry for data, testing-ground for theory and site of investigation, history has been one of the unacknowledged partners of International Relations. The last two decades has witnessed both a substantial increase in the scope of historical IR scholarship and in the sophistication of methodological approaches to history, accompanied by a rapidly increasing (and multidisciplinary) interest in the history of international thought, as well as an ever more sophisticated historiography of the discipline itself.

This Major Work is structured in a way to engage with the key recent...