Marburg Files
The Marburg Files, also known as the Windsor Files or Duke of Windsor Files, are a series of documents discovered in Germany during May 1945 near the Harz Mountains and compiled at Marburg Castle, Hesse. The files are alleged to have detailed a 1940 Nazi plot titled Operation Willi, attempting to persuade the Duke of Windsor to side with the Nazis in a bid to bring the United Kingdom into peace negotiations. The files were sent to the United Kingdom, where they were suppressed from public knowledge for many years.