Princess Caroline of Monaco honorific prefix Serene Highness
Princess Caroline of Monaco (Caroline Louise Marguerite; born 23 January 1957) is, by her marriage to Prince Ernst August, the Princess of Hanover. As the eldest child of Rainier III, Prince of Monaco, and Grace Kelly, she is the elder sister of Albert II, Prince of Monaco, and Princess Stéphanie.
She was Hereditary Princess of Monaco and heir presumptive to the Monegasque throne from her birth in 1957 until her brother Albert was born the following year, and again from Albert's accession in 2005 until the birth of his twins, her niece Gabriella and nephew Jacques, in 2014.Princess Alexandra Charlotte Ulrike Maryam Virginia of Hanover (born 20 July 1999 in Vöcklabruck, Austria)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 third cousin once removed (Queen Victoria 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 As a legitimate male-line descendant of George III, Ernst August was subject to the Royal Marriages Act 1772 (repealed in 2015).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.Likewise, the Monégasque court officially notified France of Caroline's contemplated marriage to Prince Ernst August and received assurance that there was no objection, in compliance with Article 2 of the 1918 Franco-Monégasque Treaty. Despite obtaining the official approval of the governments of France, Monaco and the United Kingdom, upon Caroline's marriage to Ernst August he forfeited his own place in Britain's order of succession. He is also subject to the Act of Settlement 1701, which imposes that consequence upon British dynasts who marry Roman Catholics.   The Succession to the Crown Act of 2013 however removed that consequence of marrying a Roman Catholic, and would place him back in the order of succession.
In 2009, it was reported that Caroline had separated from Ernst August and returned to live in Monaco.Titles, styles, honours and arms
Titles and styles
23 January 1957 – 23 January 1999: Her Serene Highness Princess Caroline of Monaco
23 January 1999 – present: Her Royal Highness The Princess of Hanover
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