S TATES are free, yet everywhere live under international courts. Sovereign states are no longer in a state of nature without arbitrators among them on matters ranging from territorial disputes and human rights to international crimes, cross-border trade, and investment. The core task of these international courts and tribunals (ICs) is to adjudicate disputes through interpretation and application of international law by legal methods. Their judicial adjudication may also contribute indirectly to a range of tasks-to prevent war, protect human rights and foreign direct investments, harmonize international law, but also to usurp law-making power or perpetuate global injustice and domination. As ICs proliferate and gain power across ever more domains, they become targets of a bewildering range of resistance. 1 Criticisms often invoke 'legitimacy'. Some question ICs' origins-querying, for instance, why developing states are forced to accept investment tribunals that privilege foreign investors. 2 Their processes are criticized-for example, when UK Brexiteers challenge the legality of treaty interpretations by the Court of Justice of the European Union (CJEU). 3 The interpretations by the Appellate Body of the World Trade Organization (WTO AB) face criticism both for being too expansive 4 and for not protecting the environment even more. 5 ICs' legitimacy may also suffer from their outputs, be it the backlog of cases of the European Court of Human Rights (ECtHR) 6 or the 1 Two Scandinavian research centres focus on ICs: jura.ku.dk/icour ts/ and www.pluri courts.no.