Pacta sunt servanda is a series on legal history with focuses on comparative constitutional law, international public law, and legal philosophy. There is no consensus definition of 'law': it is positive and natural, common and civil, religious and secular, public and private, customary and codified, language game and universal code. Though we will in this series deal primarily in questions of history, our analysis will also be informed by insights from the fields of geography, economics, philosophy, anthropology, linguistics, sociology, and politics. With an interdisciplinary approach and an awareness of the instability of its subject, Pacta sunt servanda examines our laws in the fullness of their material and discursive histories.