In this course, students are expected to acquire knowledge about the structure, foundations and sources of Public International Law, as well as the relationship and interaction between international players. Further, attention is drawn to the relationship between public international law and internal law, specially from the point of view of the Portuguese Constitution. Moving forward to two central matters of Public International Law, the discipline will deal with the Law of Conflicts and the International Protection of Human Rights. It is expected that the students analyse the international reality with a critical spirit, being able to discern the traces of normativity and inherent justice.