The wedding of Charles, Prince of Wales, and Lady Diana Spencer took place on 29 July 1981 at St Paul’s Cathedral in London.  Their marriage was seen as the “wedding of the century”.  It was watched by an estimated global TV audience of 750 million.

Charles had known Diana for a few years prior to their wedding.  Diana and Charles had been dating for about six months when he proposed on 3 February 1981 at Windsor Castle. 

Their engagement was official on 24 February 1981. Diana selected an elegant, large ring that had 14 solitaire diamonds surrounding a 12-carat oval blue Ceylon sapphire set in 18-karat white gold. This is the ring that the Duchess of Cambridge now wears.

In attendance at the wedding were 3500 guests at St. Paul’s Cathedral in London.

Royal Guests, via Wikipedia (quoted from http://bit.ly/1k0dwlV )

• The Aga Khan and Princess Salimah Aga Khan
• Prince and Princess Ludwig of Baden (Charles’s first cousin and his wife)
• The King and Queen of the Belgians
• King Simeon II and Queen Margarita of the Bulgarians
• The Queen and Prince Consort of Denmark
  • Prince George Valdemar of Denmark
• King Constantine II of the Hellenes (Charles’s second cousin)
  • Crown Prince Pavlos of Greece
  • Prince Nikolaos of Greece and Denmark
  • Princess Alexia of Greece and Denmark
• Prince and Princess George William of Hanover (Charles’s aunt and uncle)
  • Prince Georg of Hanover (Charles’s first cousin)
• Prince and Princess Karl of Hesse (Charles’s first cousin and his wife)
• Princess Christina Margarethe of Hesse and Robert van Eyck (Charles’s first cousin and her husband)
• Princess Dorothea and Prince Friedrich Karl ofWindisch-Grätz (Charles’s first cousin and her husband)
  • Princess Marina of Windisch-Grätz
• The Princess of Hesse and by Rhine
• The Prince and Princess of Hohenlohe-Langenburg (Charles’s first cousin and his wife)
• Prince and Princess Andreas of Hohenlohe-Langenburg (Charles’s first cousin and his wife)
• Prince and Princess Albrecht of Hohenlohe-Langenburg (Charles’s first cousin and his wife)
• Princess Beatrix of Hohenlohe-Langenburg (Charles’s first cousin)
• The Crown Prince and Crown Princess of Japan
• The Crown Prince and Crown Princess of Jordan
• The Queen of Lesotho
• The Prince and Princess of Liechtenstein
• The Grand Duke and Grand Duchess of Luxembourg
• The Princess of Monaco
  • The Hereditary Prince of Monaco
• Prince Gyanendra and Princess Komal of Nepal
• The Queen and Prince Claus of the Netherlands
• The King Norway
  • The Crown Prince and Crown Princess of Norway
• King Michael I and Queen Anne of Romania
• The King and Queen of Sweden
  • Princess Margaretha, Mrs. Ambler and Mr. John Ambler
• Princess Maha Chakri Sirindhorn of Thailand
• The King and Queen of Tonga
• The Malietoa of Western Samoa
• Former Crown Prince Alexander of Yugoslavia
  • Prince and Princess Tomislav of Yugoslavia (Charles’s first cousin and her husband)
  • Prince Nikola of Yugoslavia
  • Princess Katarina of Yugoslavia
  • Prince Christopher of Yugoslavia
  • Princess Maria Tatiana of Yugoslavia
  • Princess Olga of Yugoslavia
  • Prince and Princess Alexander of Yugoslavia (Charles’s second cousin and his wife)
  • Princess Elizabeth of Yugoslavia (Charles’s second cousin)