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Sir Philip Mountbatten, newly titled Duke of Edinburgh (front, second from right), with fellow Royal Navy officers at his bachelor party at the Dorchester Hotel, London, 19th November 1947. Seated to the right of him is his uncle, Louis Mountbatten, 1st Earl Mountbatten of Burma (1900 - 1979) and to the left, Captain McGregor. Philip is to marry Princess Elizabeth (later Queen Elizabeth II) the following day. (Photo by Keystone/Hulton Archive/Getty Images)

Sir Philip Mountbatten, newly titled Duke of Edinburgh (front, second from right), with fellow Royal Navy officers at his bachelor party at the Dorchester Hotel, London, 19th November 1947. Seated to the right of him is his uncle, Louis Mountbatten, 1st Earl Mountbatten of Burma (1900 - 1979) and to the left, Captain McGregor. Philip is to marry Princess Elizabeth (later Queen Elizabeth  II) the following day. (Photo by Keystone/Hulton Archive/Getty Images)