Queen Elizabeth dedicated over seven decades of her life to protecting the British monarchy, and in her final hours, she prioritized diplomacy and preparing her heir, King Charles, for his role. In a new royal biography, Robert Hardman reveals Her Majesty penned two notes before passing away. “It was the last one that had gone up to the Queen before her death,” Hardman wrote in The Making of a King: King Charles III and the Modern Monarchy. “Like all red boxes, it had just two keys, one for the monarch and the other for her duty private secretary.” Elizabeth was aware that her health was decli…