Over the course of the second half of the 20th century, economic sanctions have been openly hailed and constantly refined as modern, moderate, and moral substitutes for war. This image requires us to largely overlook the long history of practices of economic sanctioning - which is all the easier done since this history is as yet only partially known. My project aims to address this issue by turning towards a period believed to be crucial for the development of scholastic economic thought, of the domestication and monopolisation of violence, of economic and commercial expansion, and of the juridification of conflict: the high middle ages. It proposes to conduct a comprehensive survey of practices of economic sanctioning in the Anglo-Norman world between c. 1100 and c. 1300. Research on medieval economic sanctions has only taken off in the last decade. This project will further broaden the horizons of medieval economic sanctions research by putting at its core economic sanctions as societal practice rather than legislated entity, aiming to investigate all forms of economic sanctioning practices described in contemporary narrative sources, the full range of regnal, sub-regnal, and international, lay and ecclesiastic, male and female actors engaged in these practices, and the intentions, effects, and interpretations connected to them. Practices of economic sanctioning, such as boykott, punitive tarriffs, import or export quotas, import or export licensing systems, asset friezes, sequestrations, blockades or travel restrictions, need to be made visible as a part of medieval political repertoires that gained increasing traction also as a part of contemporary commentary on the vicissitudes of power and the development of history. The project will then draw these analyses together under the overarching question of economic sanctioning practices’ relationship with high medieval war and enmity. A key factor in this project’s approach, complementing traditional medievalist’s methodologies, will be a dialogue with sanctions research in the Social Sciences. While debates during the second half of the 20th century tended to focus mainly on sanctions’ (questionable) effectiveness, more recent developments in modern sanctions research draw nearer to historical approaches by inquiring into processes and meanings around sanctioning practices. Modern typologies of economic sanctioning adaptable to the medieval evidence will facilitate the identification of hitherto unexplored economic sanctions episodes, in narrative sources whose potential for informing our understanding of medieval economic sanctions is yet far from exhausted. Analysing this medieval evidence base with the interests of recent sanctions research in mind, testing the applicability of distinctions such as smart/collective sanctions, punitive/coercive sanctions, or capital/transaction sanctions, is a fruitful exercise in controlled anachronism that will throw into sharper relief both the specificities of a high medieval Anglo-Norman economic sanctions landscape and potential comparisons and contrasts between the premodern and modern history of economic sanctions.