Chapter 1 examines the new definitions of antiquity that emerged after the First World War and relates them to the new post-war imperial order and international system. It tracks the shift from a perception of ancient objects and monuments as the loot of victors, through their handling within the framework, which had first emerged in the nineteenth century, of laws of war, to their treatment as a part of policies of an imperial peace in the Middle East—in peace treaties and the new mandates system. The chapter follows the internationalization of the discourse on antiquity and the formation of a new “regime of antiquities”, a term referring to international and local mandatory legislation on archaeology and to practices of its monitoring. It offers a view “from above” of the new regime and its formulation by internationalist experts, within the League of Nations and its organizations for intellectual cooperation, such as the International Institute for Intellectual Cooperation (IIIC) and International Museums Office (OIM), and of internationalist apparatuses, as well as considering the implementation of the regime “on the ground” by the antiquities’ administrations in mandate A territories, formerly under Ottoman rule (Palestine and Transjordan, and Iraq), and the nominally independent Egypt. The chapter demonstrates how the internationalist pull and discourse seeped to colonial rhetoric but conflicted with notions of imperial sovereignty and the power of the mandatories to implement policies on the ground. At the same time, visions of regional cooperation amongst archaeologists and national rights to patrimony were adopted by local archaeologists and nationalists.