I. De Winter, L. Keywords: Nationality | Mots clefs: Nationalité | ABSTRACT Louis De Winter devotes his course on a controversy between the principle of domicile and the principle of nationality in private international law. After a presentation of the origin of the controversy concerning these two principles, Louis de Winter presents the difficulties related to the principle of nationality, the concept of domicile, and the emergence of the notion of habitual residence as a connecting factor. He then examin…