A marriage of state is a diplomatic marriage or union between two members of different nation-states or internally, between two power blocs, usually in authoritarian societies and is a practice which dates back into ancient times, as far back as early Grecian cultures in western society, and of similar antiquity in other civilizations. The fable of Helen of Troy may be the best known classical tale reporting an incidence of surrendering a female member of a ruling line to gain peace or shore up alliances of state between nation-states headed by small oligarchies or acknowledged royalty.

George I was King of Great Britain and Ireland from 1 August 1714 and ruler of the Electorate of Hanover within the Holy Roman Empire from 23 January 1698 until his death in 1727. He was the first British monarch of the House of Hanover.