What is "lex loci celebrationis"

Lex loci celebrationis is a Latin term for a legal principle in English common law, roughly translated as "the law of the land ( lex loci) where the marriage was celebrated". It refers to the validity of the union, independent of the laws of marriage of the countries involved: where the two individuals have legal nationality or citizenship, or where they live (reside or are domiciled). The assumption under the common law is that such a marriage, when lawfully and validly celebrated under the relevant law of the land, is also lawful and valid.