In its post-2000s expansion, the history of international law has more openly embraced the interdisciplinary pollination of a research field that blends international relations theory and its historical discourse, legal history, the history of ideas and political thought, and history writ large with the history of international legal practice and theory. It is being currently cultivated by a heterogeneous group of scholars made up of international lawyers occasionally transmuted into amateur historians; legal historians sporadically struggling to present themselves as savvy international lawyers; historians of international political thought sometimes posing as all the aforementioned; and, occasionally too, professional historians, who, as Andrew Fitzmaurice notes, are increasingly ‘engaging with the subject as part of their turn to the international dimension of history’. The disciplinary boundaries of international legal history have correspondingly become more fruitfully porous to a number of adjacent academic disciplines which, like international law itself, have also been significantly impacted by globalization and, in its wake, by the decrease in the intellectual leverage of ‘methodological nationalism’ which the professional birth of the academic disciplines of both law and history were born tied to in the late nineteenth century.