The International Court of Justice in The Hague has been busier than ever in recent years: it has been asked to render judgments and issue advisory opinions on conflicts in Gaza, Ukraine and Myanmar, among others, and it settles border disputes all over the world. What roles does this Court of Justice play in such cases, and how can its authority be explained? Rosa Möhrlein examined these questions and will defend her Ph.D. thesis at Radboud University on 28 August.