Challenging the classic narrative that sovereign states make the law that constrains them, this book argues that treaties and other sources of international law form only the starting point of legal authority. Interpretation can shift the meaning of texts and, in its own way, make law. In the practice of interpretation actors debate the meaning of the written and customary laws, and so contribute to the making of new law. In such cases it is the actor's semantic authority that is key - the capacity for their interpretation to be accepted and become established as new reference points for...