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with which to investigate it, prior to the renewed interest in natural and Roman law in the twelfth and thirteenth centuries. 18 International law is more than doctrine, however, and scholars frequently accept that it has developed in practice over a long time. 19 Yet, works examining international legal practice across any historical period are significantly fewer than those exploring doctrine. The
historical periods other than the medieval. One reason for this, as mentioned in the introduction, is that works examining international legal practice, including that in treaties, across any historical period are significantly fewer than those exploring doctrine. In fact, understanding the function, role, and theory behind particular aspects of treaties, e.g., amnesty or necessity, in the period 700 to 1200