Since 1914, the Round Tower at Windsor Castle has housed the Royal Archives, a vast collection of royal correspondence and memorabilia ranging from Elizabeth I’s household accounts to the present queen’s 100th birthday message to the Queen Mother. Published to mark the Archive’s 100th year at Windsor, this volume presents reproductions and transcripts of handwritten letters, journal entries and other documents, including Victoria’s letter to Florence Nightingale in Crimea and Winston Churchill’s letter to George VI, written in January 1941.