This chapter explores how international law and its legitimacy could be improved and made more aligned with the demands of justice. It focuses on two types of requirements. First, there are the principles and accompanying procedures on the basis of which actors ask their agency (and their rights) to be recognized by international law and its culture of legitimacy. These principles are consent, justification, accountability, consistency, representation and participation, and non-abuse of power. Second, there are the topics around which this quest for the recognition of agency (and rights) takes place. They are better universality of international law, human rights as a benchmark of the legitimacy of sovereignty, compliance/enforcement/accountability, and human rights supported by public goods. These two kinds of requirements have been at the center of the efforts to make international law more inclusive as well as more legitimate, and they need to be taken more seriously in the future.