In the current globalized world with its high level of international migration, international marriage is not something uncommon. As a result of population migration, for example, the marriage of two persons of different nationalities occurs. This thesis defines matrimonial law in the context of private international law. It offers an insight into the conflict of laws surrounding the issues of marriage with an international element, defining the form in which the international element can arise in international matrimonial law. National, EU and international legislation is taken into account when dealing with the issues surrounding conflict of laws. In addition to the introduction and conclusion, the thesis is divided into six chapters. The first three chapters contain the theoretical aspects, which is crucial for understanding the topic of the thesis. The remaining three chapters deal with specific institutions within matrimonial law. The first chapter defines the concepts of marriage, private international law, and marriage in the context of private international law, which includes a brief look at the historical development of this branch of law. The second chapter focuses on an overview of the sources of legislation at the national, EU and international level, including their interrelationship....

Les règles matérielles de droit international privé sont classiquement définies comme étant des règles qui apportent une réponse sur le fond à une question de droit international privé. Elles se distinguent ainsi de la traditionnelle règle de conflit de lois neutre, abstraite et bilatérale, qui se limite, dans sa forme initiale, à la désignation de l’ordre juridique dans lequel sera puisée la règle qui apportera une réponse sur le fond au litige. Cette définition montre aujourd’hui ses limites tant les méthodes du droit international privé ont évolué. Des rapprochements se sont opérés de sorte que les frontières qui délimitaient les différentes méthodes du droit international privé sont devenues plus floues, entrainant des incertitudes quant au régime juridique de ces règles. Nous avons tenté, à travers l’étude de la physionomie des règles matérielles de droit international privé, de proposer une définition qui prenne en compte leur spécificité mais également leur variété tout en les distinguant des méthodes voisines et, en particulier, des lois de police. Cette définition nous a conduit à un classement des règles matérielles en sous-catégories et nous amène à nous orienter vers la variabilité de leur régime juridique. / The material rules of private international law are classically defined as rules that provide substantive answers to a question of private international law. They are distinguished from the traditional conflict of laws rule which is neutral, abstract, bilateral and limited, in its initial form, to the designation of the applicable legal order. This definition shows its limits as the methods of private international law have evolved. Boundaries between the different methods became more unclear, leading to uncertainty as to the legal regime of the material rules. We have tried, through the study of material rules of private international law, to propose a definition that takes into account their specificity but also their variety while distinguishing them from neighboring methods and, in particular, police laws. This definition has led us to a classification of material rules and to the conclusion that their legal regime should depend of the particular subcategory they belong to.