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 unhappy with her husband. Shortly thereafter, she left the country permanently, and the princely couple's marriage was annulled in 1880. Louis was raised in Germany by his mother and stepfather, Count (later Prince) Tassilo Festetics von Tolna, along with his eldest half-sister, Maria-Mathilde (later grandmother of Princess Ira von Fürstenberg), and did not see his father until age 11 when he was obliged to return to Monaco to be trained for his future princely duties. Louis' father, Prince Albert I, was a dominating personality who had made Monaco a center of cultural activity and whose intellectual achievements were recognized around