Monaco home and held in the Drancy deportation camp outside the French capital before being transported to the Auschwitz concentration camp, where he was later killed. Blum's colleague Raoul Gunsbourg, the director of the Opéra de Monte-Carlo, helped by the French Resistance, escaped arrest and fled to Switzerland. In August 1944, the Germans executed René Borghini, Joseph-Henri Lajoux and Esther Poggio, who were Resistance leaders. Rainier III, who ruled until 2005, succeeded to the throne following the death of his grandfather, Prince Louis II, in 1949. On 19 April 1956, Prince Rainier married the American actress Grace Kelly; the event was
Honoré IV, Prince of Monaco Honoré IV, Prince of Monaco Honoré IV (17 May 1758 – 16 February 1819) was Prince of Monaco and Duke of Valentinois from 12 March 1795 to 16 February 1819. He was the son of Prince Honoré III by his wife, Maria Caterina Brignole, a Genoese noblewoman. After the fall of Napoleon I, he regained control of the principality thanks to a clause added by Charles Maurice de Talleyrand-Périgord at the Congress of Vienna stating that, " "the Prince of Monaco should return to his estates"", and passed on his titles to his eldest son, Honoré V, Prince of Monaco.