Family law: Validity of marriages: Marriage certificate + Matrimonial regime

A marriage certificate (sometimes called: marriage lines by the British) is an official statement that two people are married. In most jurisdictions, a marriage certificate is issued by a government official only after the civil registration of the marriage.

In some jurisdictions, especially in the United States, a marriage certificate is the official record that two people have undertaken a marriage ceremony. This includes jurisdictions where marriage licenses do not exist. In other jurisdictions, a marriage license serves a dual purpose of granting permission for a marriage to take place and then endorsing the same document to record the fact that the marriage has been performed.

A marriage certificate may be required for a number of reasons. It may be required as evidence of change of a party's name, on issues of legitimacy of a child, during divorce proceedings, or as part of a genealogical history, besides other purposes.

Matrimonial regimes, or marital property systems, are systems of property ownership between spouses providing for the creation or absence of a marital estate and if created, what properties are included in that estate, how and by whom it is managed, and how it will be divided and inherited at the end of the marriage. Matrimonial regimes are applied either by operation of law or by way of prenuptial agreement in civil-law countries, and depend on the lex domicilii of the spouses at the time of or immediately following the wedding. In most common law jurisdictions, the default and only matrimonial regime is separation of property, though some US states, known as community property states, are an exception. Also, in England, the birthplace of common law, pre-nuptial agreements were until recently completely unrecognized, and although the principle of separation of property prevailed, Courts are enabled to make a series of orders upon divorce regulating the distribution of assets.

Civil-law and bijuridical jurisdictions, including Quebec, Louisiana, France, South Africa, Italy, Germany, Switzerland, and many others, have statutory default matrimonial regimes, in addition to or, in some cases, in lieu of regimes that can only be contracted by prenuptial agreements. Generally, couples marry into some form of community of property by default, or instead contract out under separation of property or some other regime through a prenuptial agreement passed before a civil-law notary or other public officer solemnizing the marriage. Five countries, including the Netherlands, have signed on to the Hague Convention on the Law applicable to Matrimonial Property Regimes, which entered into force on 1 September 1992, which allows spouses to choose not only the regimes offered by their country, but also any regime in force in the country where at least one is a citizen or resident or where marital real estate is situated.