Caroline, Princess of Hanover Caroline, Princess of Hanover Caroline, Princess of Hanover (Caroline Louise Marguerite Grimaldi; born 23 January 1957), is the eldest child of Rainier III, Prince of Monaco, and the American actress Grace Kelly. She is the elder sister of Prince Albert II and Princess Stéphanie. Until the births of her niece and nephew, Princess Gabriella and Prince Jacques, in December 2014 she had been heir presumptive to the throne of Monaco since 2005, a position which she previously held from 1957 to 1958. Caroline is married to Ernst August, Prince of Hanover (born 1954), the heir to the former throne of
Louis II, Prince of Monaco Louis II, Prince of Monaco Louis II (12 July 1870 – 9 May 1949) was Prince of Monaco from 1922 to 1949. Born Louis Honoré Charles Antoine Grimaldi in Baden-Baden, Germany, he was the only child of Prince Albert I of Monaco (1848–1922), and Lady Mary Victoria Hamilton (11 December 1850 – 14 May 1922). His mother was a daughter of William Alexander Anthony Archibald Hamilton, 11th Duke of Hamilton, and his wife, Princess Marie Amélie Elizabeth Caroline of Baden. Within a year of his parents' marriage Louis was born, but his mother, a strong-willed 19-year-old, disliked Monaco and was