Prince Charles and Camilla married each other on 9 April 2005, and she started to be called "Her Royal Highness" The Duchess of Cornwall. When their engagement was announced, it was also said that she would not be known as "The Princess of Wales". This was because Prince Charles' extremely popular first wife, Diana, Princess of Wales, held that title from 1981 until her death in 1997. The relationship between Camilla and Prince Charles began when they met at a polo match in 1970. Camilla was seen to be an unsuitable match for the future king. 