The mission of The Italian Yearbook of International Law is to make available to the English-speaking public the Italian contribution to the literature and practice of international law. Volume XXX (2020) opens with a contribution tracing the history of the Yearbook, on the occasion of the publication of its Thirtieth Anniversary Volume. It then hosts a Symposium on cities and international law. There follows a Focus on the Enrica Lexie arbitral award. As in every volume the following sections feature Articles, Practice of International Courts and Tribunals, Italian Practice of International Law and Bibliographies.