The Duchess of Cornwall (Camilla Shand as she then was) and the Prince Charles began their relationship in 1970, at a polo match before either of them were married. Friendship grew into romance, with Camilla often spending time in the Prince's apartments in Buckingham Palace. Charles and Camilla soon were frequently seen out together enjoying themselves.
Camilla eventually married Army officer Andrew Parker Bowles in July 1973 shortly after Prince Charles was sent abroad on a naval posting. Andrew Parker Bowles was a friend of the Prince of Wales and a apparently a godson of Queen Elizabeth the Queen Mother
Camilla's relationship with Charles continued as friendship. Charles became a regular guest at the Parker Bowles' house and was a godfather to their first child.
Camilla was official escort to the Prince during the Zimbabwean independence celebrations in 1980 (Charles did not marry Diana until 1981).
Throughout it all, Camilla declined to make any public comment. After her divorce from Andrew Parker Bowles, she had moved to Raymill House, a 30-minute drive from Prince Charles's Highgrove home. This made her contact with Charles much easier, and they could stop relying on discreet friends with country houses offering them accommodation.
Camilla was not popular with the British public at this time. The airing of the 'Camillagate' tapes, mobile phone conversations between Camilla and Charles, which had been plucked off the airways by a scanner, did not help her image. She said in the tapes 'I'd suffer anything for you. That's love.' And Charles said that he would like to 'live inside your trousers', with a reference to a tampon thrown in.
The Prince of Wales later made a public admission, in a television interview with Jonathan Dimbleby, that he had in fact committed adultery. The Parker-Bowleses soon announced their divorce in 1995, although they had been living apart for some time. Andrew Parker Bowles soon remarried.
Diana had originally been a friend of Camilla, but later started to refer to her as"the Rottweiler". Diana understood Camilla had known before she did, that Charles was going to propose marriage to Diana. And the Princess of Wales publicly blamed the extra-marital relationship between her husband and Camilla for the break-up of their marriage, saying "There were three in the marriage, so it was a bit crowded."
Interesting reading:
uk.pinterest.com/l2footemartin/ukdiana-betrayed-by-charles-camilla/
Camilla is a Grandmother – She has two children from her first marriage and five grandchildren. One of her grandchildren, Eliza Lopes, was a bridesmaid at William and Kate’s
Just google Camilla, Charles and Diana and there's lots more.