Divorced wives[edit]
A peeress retains her legal right to the peerage style following divorce and even upon her remarriage to a non-peer.[1] A convention has developed whereby her Christian name is added in front of her title to distinguish her from any subsequent wife of her former husband. Hence, "Her Grace The Duchess of London" becomes "Mary, Duchess of London". In written forms, she is not entitled to the use of the address "Her Grace..." but may be addressed as "Duchess". "The Rt Hon. The Lady London" becomes "Mary, Lady London" and may be addressed as "Lady London," or "My Lady".
On 21 August 1996 letters patent changed titles of divorced wives of British princes, depriving their former wives of the style of Royal Highness. For this reason Her Royal Highness The Princess of Wales after divorce became Diana, Princess of Wales. The same happened to Her Royal Highness The Duchess of York who became Sarah, Duchess of York.