Act Governing the Choice of Law in Civil Matters Involving Foreign Elements Article 45

(1) The formation of an engagement to marry is governed by the respective national law of each party. However, an engagement to marry is also effective if it satisfies the formal requisites of the national law of one of the parties or of the law of the place where the engagement is concluded.(2) The effect of an engagement to marry is governed by the national law common to the parties; in the absence of a common national law, by the law of the domicile common to them; in the absence of a common law of domicile, by the law most closely connected with them.