Her husband's title as Duke of Brunswick is honorific since the ruling family of that state was removed by the Weimar Republic in 1918, along with all royal and noble German ruling families, which were still allowed to retain their titles. Neither she nor her husband has royal rank in Germany, but Monaco recognizes the Hanoverians' former German royal titles, attributing to the couple the style of "Royal Highness". On 11 January 1999, shortly before Caroline and Ernst's wedding, his fourth cousin once removed (George III was their common ancestor), Queen Elizabeth II of the United Kingdom, issued this Order in Council, "My Lords, I do hereby declare My Consent to a Contract of Matrimony between His Royal Highness Prince Ernst August Albert of Hanover, Duke of Brunswick-Luneburg and Her Serene Highness Princess Caroline Louise Marguerite of Monaco...". As a legitimate male-line descendant of George III, Ernst August was subject to the Royal Marriages Act 1772 (repealed in 2015). Prior to the repeal of the Act, the revised form of which limits those who must gain permission to the first six people in the line of British succession, marrying without the Queen's Royal Assent would have meant their marriage would be void in Britain, where Ernst August's family owned substantial property and he holds (dual) citizenship.