Prince Charles and Princess Diana pose with Queen Elizabeth II at Buckingham Palace in March 1981, shortly after their engagement. Image Source: Getty / Hulton Royals Collection With the 20th anniversary of Princess Diana's tragic death approaching, interest in her life - and especially her marriage to Prince Charles - has piqued in recent months. The relationship between Charles and Diana was tumultuous, to say the least; they met after Charles first dated Diana's older sister, Lady Sarah McCorquodale, and only went on 12 dates before getting engaged in February 1981 and tying the knot five months later. By late 1992 (after collective affairs and embarrassing leaked audio conversations), Charles and Diana's 11-year marriage was a disaster - and the royal family couldn't hide it anymore. Related14 Scandals That Will Change the Way You Think About the Royals Charles's parents, Queen Elizabeth II and Prince Philip, met with the couple for an intervention of sorts.