In depth
Lex domicilii (Latin for 'law of the domicile') is the legal principle that the law of a person's domicile (their permanent home) governs certain legal relationships — particularly family law matters like marriage, divorce, and inheritance.
For CBD cases, lex domicilii is relevant to: (1) the validity of marriages (governed by the law of the place of celebration, but sometimes by the law of the parties' domicile), (2) the legitimacy of children (governed by the law of the father's domicile in some countries), and (3) inheritance of citizenship-related rights.
Lex domicilii is distinct from lex loci (law of the place), which governs events like births and naturalizations based on where they occurred.
Related terms
Lex loci (Latin for 'law of the place') is the legal principle that the law of the place where an event occurred governs the legal consequences of that event.
Jus sanguinis (Latin for 'right of blood') is the principle that grants citizenship based on the citizenship of one's parents or ancestors, regardless of where one is born.
Sui generis (Latin for 'of its own kind') is a legal term describing something unique, often applied to citizenship regimes that don't fit standard categories.
Ex post facto (Latin for 'from after the fact') describes a law that retroactively changes the legal consequences of actions, relevant to CBD restitution laws.
Nunc pro tunc (Latin for 'now for then') is a legal phrase allowing a court to make a retroactive order, sometimes used in CBD cases to correct procedural defects.
In re (Latin for 'in the matter of') is a legal phrase used in case names for proceedings that are not adversarial, common in CBD judicial cases.