During the reign of Edward I (1272-1307), administrative recordkeeping underwent profound transitions, including the first extensive use of codices alongside rolls in the Exchequer and Wardrobe. This book focuses on the relationship between rolls and codices, with regard to both their content and their contexts of production and use. Furthermore, it investigates possible models for the diffusion of the codex during the late thirteenth and early fourteenth centuries. As a result, the study offers a new perspective on the workings of a late medieval administration.