Grzelczyk
( Case C-184/99 ); [2001] ECRI – 6193, the Court made the following landmark declaration: “ Union citizenship is destined to be the fundamental status of nationals of the Member States, enabling those who find themselves in the same situation to enjoy the same treatment in law irrespective of their nationality, subject to such exceptions as are expressly provided for. ” T his decision foreshadowed the adv ent of the co-called Citizens Directive (2004/38). This measure governs the exercise of movement between and residence within the territories of Member States by EU citizens and their family members. The Directive is not constitutive of the rights of movement and residence. Such rights are conferred by primary EU legislation. By Article 21 TFEU, Union citizens have a right to move and reside freely within the territory of any of the Member States subject to the limitations and conditions contained in the Treaties and secondary legislation. Union citizenship is established by Article 20 TFEU. Article 18 prohibits any discrimination on grounds of nationality .
13.
Subsequently, in