This volume formulates the hypothesis of a truly global revolution that reflected a Great Divide between ancient and new legal regimes. The volume brings together several case studies of transition from an ancient to a new legal regime characterized by the positivization of the law. This was an effect of Western imperialism, but also of local elites’ conviction that positive law was an efficient instrument of governance. The contributors emphasize the depth and scale of the positivist legal revolution and explore the phenomenon whether it was the outcome of either direct colonialism (Morocco, Egypt, India) or indigenous reformism (Ottoman empire, China, Japan).