GROUPED under themes such as love, family, liberation, power, and downfall, the letters in Written in History: Letters that changed the world (Weidenfeld & Nicolson, £14.99 (£13.50); 978-1-474-60918-0) are introduced by Simon Sebag Montefiore. All kinds of occasions: such as Henry VIII’s courting of Ann Boleyn, and a warning to Stalin from Tito to stop sending people to kill him, or Tito will himself send an assassin to Moscow, “and I certainly won’t have to send another.”