Princess Elizabeth (later Queen Elizabeth II) and her fiancé, Philip Mountbatten, at Buckingham Palace after their engagement was announced, July 10, 1947.

Prince Philip of Greece, later the Duke of Edinburgh, acts as an usher, assisting Princess Elizabeth, right, and Princess Margaret with their coats as they arrive for a wedding, Dec. 23, 1946.

Princess Elizabeth, later Queen Elizabeth II, with her husband, Philip, Duke of Edinburgh, at their wedding, 1947.

Princess Elizabeth and her husband, Philip Mountbatten, study their wedding photographs while on honeymoon in Romsey, Hampshire, Nov. 1947.

Princess Elizabeth and the Duke of Edinburgh arm in arm, 1947.

Princess Elizabeth and the Duke of Edinburgh at the reception at a charity ball, 1948.

Princess Elizabeth and the Duke of Edinburgh walk along Epsom racetrack, June 5, 1948.

Queen Elizabeth II and Prince Philip, Duke of Edinburgh, with their baby Prince Charles, July 1949.

The Duke of Edinburgh dances with Princess Elizabeth at a square dance held in their honor in Ottawa, Oct. 1951.

Princess Elizabeth and the Duke of Edinburgh watching a “stampede” rodeo staged for them in Calgary, Alberta, during their tour of Canada, 1951.

Queen Elizabeth II and Philip, Duke of Edinburgh, with their two children, Charles, Prince of Wales, and Princess Anne, 1951.

Queen Elizabeth with Prince Philip, Duke of Edinburgh, and her children, Charles and Anne, at Balmoral Castle, Scotland, 1952.

Queen Elizabeth II on the balcony of Buckingham Palace after her coronation ceremony, with Prince Charles, Princess Anne, and Prince Philip, Duke of Edinburgh, 1953.

Queen Elizabeth II and the Duke of Edinburgh in Colombo, Sri Lanka, after opening Parliament, 1954.

Queen Elizabeth II, the Duke of Edinburgh, Princess Anne, and Prince Charles drive from King’s Cross Station on their return from holiday at Sandringham.

The Queen and the Duke of Edinburgh on the royal tour liner during the ship’s passage through the Panama Canal to the Pacific, 1953.

Seated beside Queen Elizabeth II, the Duke of Edinburgh waves to 4-year-old Michael McCarthy during a tour of Mackay in Queensland, Australia, 1954.

Queen Elizabeth and Prince Philip pass the Statue of Liberty on their one-day visit to New York City, Oct. 21, 1957.

Queen Elizabeth and the Duke of Edinburgh during a polo game, 1956.

Queen Elizabeth II of England presents Prince Philip with a victor’s trophy in Windsor, England, June 23, 1957.

Queen Elizabeth II and the Duke of Edinburgh with their two children, the Prince of Wales and Princess Anne, at Windsor Castle, 1959.

Queen Elizabeth and Prince Philip during a royal engagement, 1953.

Queen Elizabeth II and Prince Philip, Duke of Edinburgh, watch a cricket match, Highclere, Hampshire, 1958.

Prince Philip, Jacqueline Kennedy, Queen Elizabeth, and President John F. Kennedy chat after dinner at Buckingham Palace, 1961.

Queen Elizabeth and the Duke of Edinburgh at the 1961 Trooping the Colour ceremony to mark the queen’s 35th birthday.

Prince Philip and Queen Elizabeth II arrive at the Royal Ascot race meeting, England, 1962.