This episode is the second part of a four part conversation featuring Professor Mary Ellen O’Connell talking about themes emerging from her 2019 book, "The Art of Law in the International Community." O’Connell is the Robert and Marion Short Professor of Law and Research Professor of International Dispute at Notre Dame. O’Connell is joined by Professor Samuel Moyn, the Henry R. Luce Professor of Jurisprudence and Professor of History at Yale Law School. They discuss the history of legal movements to prohibit the use of force and military aggression.