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 I, Prince of Monaco Louis I, Prince of Monaco Louis I, Prince of Monaco (25 July 1642 in Prince's Palace of Monaco – 3 January 1701 in Rome) was Prince of Monaco from 1662 until 1701. "Louis Grimaldi" was the elder son of Prince Hercule of Monaco and Maria Aurelia Spinola. Louis married Catherine Charlotte de Gramont, daughter of Marshal Antoine III de Gramont, on 30 March 1660 in Pau. They had six children: In 1662 Louis succeeded his grandfather Honoré II as Prince of Monaco. In 1666 he distinguished himself at the Four Days' Battle between the English and Dutch fleets. On 5