By Ellie Fry Prince William was just 14 years old when his parents got divorced. ThePrince of Wales, who is the next heir to the British throne, also had to witness his parents very public fallout – and the tragic death of his mother in 1997. But when the People’s Princess had her HRH title stripped away from her – William made an agonising promise that reduced her to tears. After one of the most famous royal weddings, Lady Diana Spencer became Her Royal Highness, The Princess of Wales in 1981. Reports say the late Queen was happy for her to keep the title as she was the mother of a future Kin…