The development of the European Union leads to an increasing freedom of movement of citizens. One of the consequences of this freedom is the emergence of the need to create common rules for the EU citizens. As regards the harmonisation of the rules of the spouses' property regimes and the property consequences of registered partners, the regulations 2016/1103 and 2016/1104 occur. These regulations do not apply in all Member States of the European Union, but only in those which have joined the enhanced cooperation. In these regulations, we may find the principle of autonomy of the will of the parties. The autonomy of the parties’ will, gives the them the opportunity to choose a competent court and applicable law for their legal relationship. As regards the election of the competent court for the property regimes of spouses and registered partners of the regulations 2016/1103 and 2016/1104 place the autonomy of the parties’ will in a secondary place. However, as regards the autonomy of the parties’ will for the applicable law in the property regimes of spouses and registered partners the regulations 2016/1103 and 2016/1104 give it preference over other connecting factors. This thesis will examine the emergence and development of regulations 2016/1103 and 2016/1104, their concepts and elements, and explain what the autonomy of the parties’ will is and how it affects the jurisdiction of the court and the applicable law in the regulations 2016/1103 and 2016/1104.