The Royal Archives was established in the Round Tower at Windsor Castle in 1911. This was made necessary principally by the large accumulation of papers from the reign of Queen Victoria and also of the official papers of King Edward VII. Queen Victoria conducted a vast correspondence, both official and private, throughout her long life, resulting in an enormous volume of archival material. Prince Albert gradually took control of her official correspondence and set up a highly organised filing system in which the papers from that period are still kept. for more click here