Much emphasis has been placed on the role that individualism, self-interest and reciprocity have in the formation and function of international legal rules. Rarely has attention been given to the presence of altruism in legal systems, let alone the international legal system. In a study that is the first of its kind in international legal scholarship, Altruism in International Law explores and analyses the emergence of altruistic legal relationships between states and people in other countries. The book also argues that the impulse for the emergence of these relationships is a cosmopolitan ideology, which co-exists with a persisting statist ideology, among the major actors in international law-making processes. Further still, the book reveals that individualistic legal norms are more often manifested as strict rules while altruistic legal norms find expression in flexible standards. This suggests that there is a connection between substance and form in international law.