The Irish Yearbook of International Law supports research into Ireland’s practice in international affairs and foreign policy, filling a gap in existing legal scholarship and assisting in the dissemination of Irish policy and practice on matters of international law. On an annual basis, the Yearbook presents peer-reviewed academic articles and book reviews on general issues of international law, as well as topics with significant interest for an Irish audience. Designated correspondents provide reports on international law developments in Ireland, Irish practice in international bodies, and the law of the European Union as relevant to developments in Ireland. This volume of the Yearbook includes contributions on international humanitarian law, including intersections with international human rights law and the law of state responsibility, the concept of due diligence in international law, and the exercise of international criminal jurisdiction with specific reference to Irish law.